#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001


int main(){
	
	string s;
	cin>>s;
	
	while(s.size()!=3)s.insert(s.begin(),'0');
	cout<<s<<endl;
	
	return 0;
}