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

const int mod = 1e9+7;
const int INF = 2000000;
const double PI = acos(-1.0);

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