#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

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

    return 0;
}