#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using P = pair<int, int>;

int main(void)
{
  string s;
  cin >> s;
  if (s == "0")
    cout << '0' << endl;
  else
    cout << s + '0' << endl;
  return 0;
}