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

using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<long long>;
using vvi = vector<vi>;
using vs = vector<string>;
using vc = vector<char>;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(a) (a).begin(), (a).end()
template<class T> using min_pq = priority_queue<T, vector<T>, greater<T>>;

const int INF = 1e9;
const ll LINF = 1e18;

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

    ll y,n;
    cin >> y >> n;
    ll sum=0;
    rep(i,n){
        ll x;
        cin >> x;
        sum+=x;
    }
    if(sum>y) cout << "red" << endl;
    else cout << y-sum << endl;
    
}