#include <bits/stdc++.h>

using namespace std;
#define rep(i, n, o) for(int i = 0;i < (n);i++)
#define ou(x) cout << x << endl
#define ll long long
#define re return 0

int main(){
    string n;
    cin >> n;
    if(n.length() < 3) {
        while(n.length() != 3){
            n = "0" + n;
        }
        ou(n);
        re;
    }
    ou(n);
    re;
}