#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define all(x) (x).begin(), (x).end()
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vector<int>>;
const ll inf = 1e9;

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