#include<iostream>
#include<string>
#define ll long long

using namespace std;

int main(){
    ll x;
    cin >> x;
    x *= 108;
    string ans = to_string(x);
    
    ll n = ans.size();
    cout << ans.substr(0,n-2) << ".";
    cout << ans[n-2] << ans[n-1] << endl;
    return 0;
}