#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
	ll a, x;
	cin >> a >> x;
	vector<ll> v(x);
	ll sum = 0ll;
	for (int i = 0; i < x; i++) {
		cin >> v[i];
		sum += v[i];
	}
	if (sum > a) {
		cout << "red" << endl;
	}
	else {
		cout << a-sum << endl;
	}
}