#include "testlib.h"
#include <bits/stdc++.h>
using namespace std;
 
const int MAX_Y = 1'000'000'000;
const int MAX_N = 100;
const int MAX_A = 10'000'000;

int main(int argc, char* argv[]) {
    registerValidation(argc, argv);
    int Y = inf.readInt(1, MAX_Y, "Y");
    inf.readSpace();
    int N = inf.readInt(1, MAX_N, "N");
    inf.readEoln();
    vector<int> A = inf.readInts(N, 1, MAX_A, "A");
    inf.readEoln();
    inf.readEof();
    int sum = reduce(A.begin(), A.end());
    int ans = Y - sum;
    if(ans < 0) cout << "red" << endl;
    else cout << ans << endl;
}