/*
* Author      : Arman Sykot
* Date & time : 07.01.2021 11:13:23 +06
*/

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define I_am_the_one_who_KNOCKS ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

using namespace std;

const double EPS = 1e-9;

int main() {
#ifndef ONLINE_JUDGE
    freopen ("in.txt", "r", stdin);
    freopen ("out.txt", "w", stdout);
#endif
    I_am_the_one_who_KNOCKS;

    int n;
    cin >> n;

    int sum = (n * (n + 1)) / 2;

    if (sum % 2 == 0)
        cout << "black\n";
    else
        cout << "grimy\n";

    return 0;
}