#include <cstdio>
#include <cstring>
#include <cmath>
#include <queue>
#include <algorithm>
#include <iostream>
using namespace std;


int main()
{
  long long int n ;
  cin >> n;
  if(n!=0)
    cout << n << "0" <<  endl;
  else
    cout << 0 << endl;

  return 0;
}