def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

def multiply(x, y):
    return x * y

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

if __name__ == "__main__":
    print("Select operation:")
    print("1.Add")
    print("2.Subtract")
    print("3.Multiply")
    print("4.Divide")

    choice = input("Enter choice(1/2/3/4): ")

    num1 = float(input("Enter first number: "))
    num2 = float(input("Enter second number: "))

    if choice == '1':
        print(f"The result is: {add(num1, num2)}")
    elif choice == '2':
        print(f"The result is: {subtract(num1, num2)}")
    elif choice == '3':
        print(f"The result is: {multiply(num1, num2)}")
    elif choice == '4':
        print(f"The result is: {divide(num1, num2)}")
    else:
        print("Invalid input")