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

int main() {
  long long d;
  cin >> d;

  string moji = to_string(d * 108);
  int nagasa = moji.length();
  cout << moji.substr(0, nagasa - 2) << "." << moji.substr(nagasa - 2) << endl;
  return 0;
}