#include <iostream>

int main() {
    int n;
    std::cin >> n;

    n = n % 4;

    if (n == 2 || n == 1) {
        std::cout << "grimy";
    } else {
        std::cout << "black";
    }
}

only amount of odd numbers matters
and it changes every 2 numbers
so for 1, 2 - 1 odd
for 3, 4 - 2 odd numbers
and so on