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

int main() {
    int y,n;
    cin >> y >> n;
    int sum = 0;
    for(int i = 0; i<n;i++){
        int a;
        cin >> a;
        sum+= a;
    }
    if(y-sum<0) cout <<"red";
    else cout << y-sum;
	// your code goes here

}