#include<cstdio>
#include<cstdlib>
#include<vector>
#include<string>
#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
   vector<char> V;
   string S;
   int i=0;
   float f=3.14156;
   float x=f*1e6;
   long long int y=(long long int)(x);
   while(y)
   {
        V.push_back(y%10+'0');
        y/=10;
   }
   reverse(V.begin(),V.end());
   for(i=0;i<V.size()-6;i++)
   {
        S.push_back(V[i]);
   }
   S.push_back('.');
   for(;i<V.size();i++)
        S.push_back(V[i]);

   i=S.size();
   while(i--)
   {
        if(S[i]=='0')
        S.erase(S.begin()+i);
        else break;
   }
cout<<S<<"\n";
//system("pause");
return 0;
}