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

int main() {
    int N;
    cin >> N;
    if(N >= 10 && N < 100) {
        cout << "0" << N << endl;
    }
    else if(N < 10) {
        cout << "00" << N << endl;
    }
    else {
        cout << N << endl;
    }
}