#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;
struct bigInt
{
	vector<int> a;
	bigInt()
	{
		a.push_back(0);
	}
	bigInt(int x)
	{
		if(x==0)
			a.push_back(0);
		while(x!=0)
		{
			a.push_back(x%10);
			x=x/10;
		}
	}
	void operator += (const bigInt& b)
	{
		vector<int> x,y,z;
		x=a;
		y=b.a;
		int n=x.size();
		int m=y.size();
		if(n<m)
			for(int i=0;i<m-n;++i)
				x.push_back(0);
		else
			for(int i=0;i<n-m;++i)
				y.push_back(0);
		int h=0;
		for(int i=0;i<x.size();++i)
		{
			z.push_back(x[i]+y[i]+h);
			h=z[i]/10;
			z[i]%=10;
		}
		if(h==1)
			z.push_back(1);
		while(z[z.size()-1]==0)
			z.pop_back();
		a=z;
 
	}
	void operator -=( const bigInt& b)
	{
		for(int i=0;i<b.a.size();++i)
		{
			a[i]-=b.a[i];
			if(a[i]<0)
			{
				a[i]+=10;
				int j=i+1;
				while(a[j]==0)
				{
					a[j]=9;
					++j;
				}
				--a[j];
			}
		}
		while(a[a.size()-1]==0 && a.size()!=1)
			a.pop_back();
	}
	bigInt multByDigit(const bigInt& b,int x)
	{
		bigInt ans;
		vector<int> res;
		int h=0;
		for(int i=0;i<b.a.size();++i)
		{
			res.push_back( b.a[i]*x+h);
			h=res[res.size()-1]/10;
			res[res.size()-1]%=10;
		}
		if(h!=0)
			res.push_back(h);
		ans.a=res;
		return ans;
	}
	void operator *=( const bigInt& b)
	{
		bigInt ans;
		for(int i=0;i<b.a.size();++i)
		{
			vector<int> c;
			for(int j=0;j<i;++j)
				c.push_back(0);
			bigInt d;
			d=d.multByDigit(*this,b.a[i]);
			for(int j=0;j<d.a.size();++j)
				c.push_back(d.a[j]);
			bigInt temp;
			temp.a=c;
			ans+=temp;
		}
		*this=ans;
	}
 
};
istream& operator >> (istream& in, bigInt& x)
{
	string s;
	x.a.clear();
	in>>s;
	for(int i=s.size()-1;i>=0;--i)
		x.a.push_back(s[i]-'0');
	return in; 
}
ostream& operator<< (ostream& out, const bigInt& x)
{
	for(int i=x.a.size()-1;i>=0;--i)
		out<<x.a[i];
	return out;
}
bigInt operator+ (const bigInt& a, const bigInt& b)
{
	bigInt c;
	c=a;
	c+=b;
	return c;
}
bigInt operator* ( const bigInt& a, const bigInt& b)
{
	bigInt c=a;
	c*=b;
	return c;
}
bigInt operator- (const bigInt& a, const bigInt b)
{
	bigInt c;
	c=a;
	c-=b;
	return c;
}
bool operator < (const bigInt& a, const bigInt& b)
{
	if(a.a.size()<b.a.size())
		return true;
	else
	{
		if(a.a.size()>b.a.size())
			return false;
		else
		{
			int i=0;
			while(a.a[i]==b.a[i])
				++i;
			return a.a[i]<b.a[i];
		}
	}
}
int main()
{
	string ans[] = {"1", "1", "2", "6", "24", "120", "720", "5040", "40320", "362880", "3628800", "39916800", "479001600", "6227020800", "87178291200", "1307674368000", "20922789888000", "355687428096000", "6402373705728000", "121645100408832000", "2432902008176640000", "51090942171709440000", "1124000727777607680000", "25852016738884976640000", "620448401733239439360000", "15511210043330985984000000", "403291461126605635584000000", "10888869450418352160768000000", "304888344611713860501504000000", "8841761993739701954543616000000", "265252859812191058636308480000000", "8222838654177922817725562880000000", "263130836933693530167218012160000000", "8683317618811886495518194401280000000", "295232799039604140847618609643520000000", "10333147966386144929666651337523200000000", "371993326789901217467999448150835200000000", "13763753091226345046315979581580902400000000", "523022617466601111760007224100074291200000000", "20397882081197443358640281739902897356800000000", "815915283247897734345611269596115894272000000000", "33452526613163807108170062053440751665152000000000", "1405006117752879898543142606244511569936384000000000", "60415263063373835637355132068513997507264512000000000", "2658271574788448768043625811014615890319638528000000000", "119622220865480194561963161495657715064383733760000000000", "5502622159812088949850305428800254892961651752960000000000", "258623241511168180642964355153611979969197632389120000000000", "12413915592536072670862289047373375038521486354677760000000000", "608281864034267560872252163321295376887552831379210240000000000", "30414093201713378043612608166064768844377641568960512000000000000", "1551118753287382280224243016469303211063259720016986112000000000000", "80658175170943878571660636856403766975289505440883277824000000000000", "4274883284060025564298013753389399649690343788366813724672000000000000", "230843697339241380472092742683027581083278564571807941132288000000000000", "12696403353658275925965100847566516959580321051449436762275840000000000000", "710998587804863451854045647463724949736497978881168458687447040000000000000", "40526919504877216755680601905432322134980384796226602145184481280000000000000", "2350561331282878571829474910515074683828862318181142924420699914240000000000000", "138683118545689835737939019720389406345902876772687432540821294940160000000000000", "8320987112741390144276341183223364380754172606361245952449277696409600000000000000", "507580213877224798800856812176625227226004528988036003099405939480985600000000000000", "31469973260387937525653122354950764088012280797258232192163168247821107200000000000000", "1982608315404440064116146708361898137544773690227268628106279599612729753600000000000000", "126886932185884164103433389335161480802865516174545192198801894375214704230400000000000000", "8247650592082470666723170306785496252186258551345437492922123134388955774976000000000000000", "544344939077443064003729240247842752644293064388798874532860126869671081148416000000000000000", "36471110918188685288249859096605464427167635314049524593701628500267962436943872000000000000000", "2480035542436830599600990418569171581047399201355367672371710738018221445712183296000000000000000", "171122452428141311372468338881272839092270544893520369393648040923257279754140647424000000000000000", "11978571669969891796072783721689098736458938142546425857555362864628009582789845319680000000000000000", "850478588567862317521167644239926010288584608120796235886430763388588680378079017697280000000000000000", "61234458376886086861524070385274672740778091784697328983823014963978384987221689274204160000000000000000", "4470115461512684340891257138125051110076800700282905015819080092370422104067183317016903680000000000000000", "330788544151938641225953028221253782145683251820934971170611926835411235700971565459250872320000000000000000", "24809140811395398091946477116594033660926243886570122837795894512655842677572867409443815424000000000000000000", "1885494701666050254987932260861146558230394535379329335672487982961844043495537923117729972224000000000000000000", "145183092028285869634070784086308284983740379224208358846781574688061991349156420080065207861248000000000000000000", "11324281178206297831457521158732046228731749579488251990048962825668835325234200766245086213177344000000000000000000", "894618213078297528685144171539831652069808216779571907213868063227837990693501860533361810841010176000000000000000000", "71569457046263802294811533723186532165584657342365752577109445058227039255480148842668944867280814080000000000000000000", "5797126020747367985879734231578109105412357244731625958745865049716390179693892056256184534249745940480000000000000000000", "475364333701284174842138206989404946643813294067993328617160934076743994734899148613007131808479167119360000000000000000000", "39455239697206586511897471180120610571436503407643446275224357528369751562996629334879591940103770870906880000000000000000000", "3314240134565353266999387579130131288000666286242049487118846032383059131291716864129885722968716753156177920000000000000000000", "281710411438055027694947944226061159480056634330574206405101912752560026159795933451040286452340924018275123200000000000000000000", "24227095383672732381765523203441259715284870552429381750838764496720162249742450276789464634901319465571660595200000000000000000000", "2107757298379527717213600518699389595229783738061356212322972511214654115727593174080683423236414793504734471782400000000000000000000", "185482642257398439114796845645546284380220968949399346684421580986889562184028199319100141244804501828416633516851200000000000000000000", "16507955160908461081216919262453619309839666236496541854913520707833171034378509739399912570787600662729080382999756800000000000000000000", "1485715964481761497309522733620825737885569961284688766942216863704985393094065876545992131370884059645617234469978112000000000000000000000", "135200152767840296255166568759495142147586866476906677791741734597153670771559994765685283954750449427751168336768008192000000000000000000000", "12438414054641307255475324325873553077577991715875414356840239582938137710983519518443046123837041347353107486982656753664000000000000000000000", "1156772507081641574759205162306240436214753229576413535186142281213246807121467315215203289516844845303838996289387078090752000000000000000000000", "108736615665674308027365285256786601004186803580182872307497374434045199869417927630229109214583415458560865651202385340530688000000000000000000000", "10329978488239059262599702099394727095397746340117372869212250571234293987594703124871765375385424468563282236864226607350415360000000000000000000000", "991677934870949689209571401541893801158183648651267795444376054838492222809091499987689476037000748982075094738965754305639874560000000000000000000000", "96192759682482119853328425949563698712343813919172976158104477319333745612481875498805879175589072651261284189679678167647067832320000000000000000000000", "9426890448883247745626185743057242473809693764078951663494238777294707070023223798882976159207729119823605850588608460429412647567360000000000000000000000", "933262154439441526816992388562667004907159682643816214685929638952175999932299156089414639761565182862536979208272237582511852109168640000000000000000000000", "93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000"}; 
 
	int n;
    cin>>n;
    cout<<ans[n];
    return 0;
 
}