#include <bits/stdc++.h>
using namespace std;

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit);
    int Y, N;
    cin >> Y >> N;
    assert(1 <= Y && Y <= 1'000'000'000);
    assert(1 <= N && N <= 100);
    vector<int> A(N);
    for (int i = 0; i < N; i++) {
        cin >> A[i];
        assert(1 <= A[i] && A[i] <= 10'000'000);
    }
    int sum = 0;
    for (auto a : A) sum += a;
    if (sum > Y) cout << "red" << endl;
    else cout << Y - sum << endl;
    return 0;
}