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return x * y

def divide(x, y):
    if y == 0:
        return "Cannot divide by zero"
    return x / y

while True:
    print("Options:")
    print("Enter 'add' for addition")
    print("Enter 'subtract' for subtraction")
    print("Enter 'multiply' for multiplication")
    print("Enter 'divide' for division")
    print("Enter 'quit' to end the program")

    user_input = input(": ")

    if user_input == "quit":
        break
    elif user_input in ("add", "subtract", "multiply", "divide"):
        num1 = float(input("Enter first number: "))
        num2 = float(input("Enter second number: "))

        if user_input == "add":
            print("Result:", add(num1, num2))
        elif user_input == "subtract":
            print("Result:", subtract(num1, num2))
        elif user_input == "multiply":
            print("Result:", multiply(num1, num2))
return False
    for i in range(2, int(n**0.5) + 1):
        if n % i == 0:
            return False
    return True

num = int(input("Enter a number to check if it's prime: "))
if is_prime(num):
    print("Prime")
else:
    print("Not prime")