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


int main(){
	ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll Y,N;
    cin>>Y>>N;
    for(int i=0;i<N;i++){
        ll A;
        cin>>A;
        Y-=A;
    }
    if(Y<0)cout<<"red\n";
    else cout<<Y<<"\n";
    
}