#include <iostream>
#include <cmath>
using namespace std;

int main()
  {
   unsigned long long N;
   while(cin>>N)
     {
      unsigned long long x=1;
      for(unsigned long long n=2;n<=N;++n)
        {
         x*=n;
         while(!(x%10)) x/=10;
         x%=1000000000LL;
        }
      cout<<N<<" ostatnia cyfra "<<x%10<<endl;
     }
   return 0;
  }