#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <string>
#include <sstream>

#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
#define var auto
#define mod 1000000007
typedef long long ll;

using namespace std;

int inputValue(){
    int a;
    cin >> a;
    return a;
}

template <typename T>
void output(T a, int precision) {
    if(precision > 0){
        cout << fixed << setprecision(precision)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}

// end of template

int main() {
    // source code
    ll n;
    cin >> n;
    n *= 108;
    stringstream s;
    s << n;
    
    string str = s.str();
    
    string str1 = str.substr(0, str.size() - 2);
    
    string str2 = str.substr(str.size() - 2, 2);
    
    
    
    
    output(str1 + "." + str2, 0);
    
    return 0;
}