#include <cstdio>
#include <cstring>
#include <cmath>
#include <queue>
#include <algorithm>
#include <iostream>
using namespace std;
long long int N = 1000000009;

int main()
{
  string s;
  cin >> s;

  if(s == "0")
    cout << 0 << endl;
  else
    cout << s << "0" << endl;

  return 0;
}