#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<vvvl> vvvvl;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;
typedef vector<vvvb> vvvvb;
typedef pair<ll,ll> pl;
typedef pair<ll,pl> ppl;
typedef pair<ll,ppl> pppl;
typedef pair<ll,pppl> pppppl;
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define all(a) begin(a),end(a)
#define F first
#define S second
const ll mod=998244353;
const string als="abcdefghijklmnopqrstuvwxyz";
const string ALS="ABCDEFGHIJKLMNOPQRSTUVWXYZ";

int main(){
	ll y;
	int n;
	cin>>y>>n;
	rep(i,0,n){
		ll a;
		cin>>a;
		y=y-a;
	}
	if(y<0){
		cout<<"red"<<endl;
	}
	else{
		cout<<y<<endl;
	}
}