#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

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

    return 0;
}