#include <bits/stdc++.h>
using namespace std;
#define int long long
#define double long double
signed main(){
    int N;
    cin>>N;
    N *= 108;
    vector<char> A={};
    while(N != 0){
        A.push_back((char)(N%10+'0'));
        N /= 10;
    }
    reverse(A.begin(),A.end());
    for(int i=0;i<A.size();i++){
      cout<<A[i];
      if(i == A.size()-3) cout<<'.';
    }
    cout<<endl;
}