#include <bits/stdc++.h>
//#include <atcoder/all>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define Max(v) *max_element(all(v))
#define Min(v) *min_element(all(v))
#define yn(flag) if (flag) {cout << "Yes\n";} else {cout << "No\n";}
using namespace std;
//using namespace atcoder;
using str = string;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
using vint = vector<int>;
using vvint = vector<vector<int>>;
using vll = vector<ll>;
using vvll = vector<vector<ll>>;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
//using mint = modint998244353;
//using mint = modint1000000007;
template<class T> inline bool chmin(T& a, T b) {if (a > b) {a = b; return true;} return false;}
template<class T> inline bool chmax(T& a, T b) {if (a < b) {a = b; return true;} return false;}
const ll INF = 1LL << 60;
const ll mINF = -1 * INF;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    //cout << fixed << setprecision(16);

    ll Y, N; cin >> Y >> N;
    ll use = 0;
    for (ll i = 0; i < N; ++i) {
        ll A; cin >> A;
        use += A;
    }

    if (use > Y) {
        cout << "red\n";
    } else {
        cout << Y - use << "\n";
    }

    return 0;
}