Cake

weight = int(input())
lenght = int(input())
command = input()
totalPieces = 0
cakeSize = weight * lenght
sumOfPieces = 0
while command != "STOP":
    sumOfPieces = int(command)
    totalPieces += sumOfPieces
    if totalPieces > cakeSize:
        print(f"No more cake left! You need {totalPieces - cakeSize} pieces more.")
        break
    command = input()
    if command == "STOP":
        print(f"{cakeSize-totalPieces} pieces are left.")