import sys
def solve():
    it = iter(sys.stdin.read().split())
    y = int(next(it))
    n = int(next(it))
    total = 0
    for _ in range(n):
        total += int(next(it))
    if total > y:
        print("red")
    else:
        print(y - total)

if __name__ == '__main__':
    solve()