#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;

int main() {
  string S; cin >> S;
  if((int)S.size() == 1){
    if(stoi(S) == 0){
      cout << 0 << endl;
      return 0;
    }
  }
  cout << S << "0" << endl;
}