#include <iostream>
#include <cassert>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  string s; cin >> s;
  for (int i = s.size(); i < 3; i++) {
    s = "0" + s;
  }
  cout << s << endl;
  return 0;
}