#include <iostream>

using namespace std;

int main() {
	int N;
	cin >> N;
	if (N > 0 && N < 10) {
		cout << "00" << N << endl;
	}
	else if (N > 9 && N < 100) {
		cout << "0" << N << endl;
	}
	else
		cout << N << endl;
}