#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  ll d;
  cin >> d;
  string t = to_string(d * 108);
  cout << t.substr(0, t.size() - 2) + "." + t.substr(t.size() - 2) << endl;
  return 0;
}