#include<iostream>
#include<algorithm>
#include<vector>
#include<cmath>
#include<math.h>
#include<iomanip>
#include<string>
#include<functional>
#include<set>
#include<stack>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(v) v.begin(),v.end()


int main() {
    string S;
    cin >> S;
    int d = S.size();
    string ans;
    if (d == 3)ans = S;
    if (d == 2)ans = "0" + S;
    if (d == 1)ans = "00" + S;
    cout << ans;
    return 0;
}