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



int main() {
    int y,n;
    cin >> y >> n;
    int p;
    for(int i = 0; i < n; i++) {
        cin >> p;
        y -= p;

    }
    if(y >= 0) cout << y << "\n";
    else cout << "red\n";

}