#include <iostream>
#include <string>
using namespace std;
int main() {
  string s;
  while (cin >> s) {
    long long x = 0;
    for (int i = 0;; ++i) {
      if (s[i] == '.') {
        if (s[i+1] >= '5') x++;
        cout << x << endl;
        break;
      }
      x = x*10 + (s[i]-'0');
    }
  }
  return 0;
}