#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;
int main() {
	int n;
	cin >> n;
	if (n < 10) cout << "00" << n << endl;
	else if (n < 100) cout << '0' << n << endl;
	else cout << n << endl;
	return 0;
}