#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (int)(n); i++)

using namespace std;
using LL = long long;
using P = pair<int,int>;
using vv = vector<vector<int>>;
const int INF = (int)1e9;
const LL LINF = (LL)1e18;

int main(){
	string N;
	cin >> N;
	int siz = N.size();
	rep(i,3-siz) N = '0' + N;
	cout << N << endl;

	return 0;
}