#include <iostream>
#include <algorithm>
#include <cstring>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <cmath>

#define AS(a) (sizeof(a)/sizeof(a[0]))
using namespace std;
long long int MOD = 1000000007;
long long int INF = 1000000007;


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