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 "Error: Division by zero is not allowed"
    else:
        return x / y
 
print("Simple Calculator")
print("1. Addition")
print("2. Subtraction")
print("3. Multiplication")
print("4. Division")
 
choice = input("Enter your choice (1-4): ")
 
if choice in ['1', '2', '3', '4']:
    num1 = float(input("Enter first number: "))
    num2 = float(input("Enter second number: "))
 
    if choice == '1':
        print(f"{num1} + {num2} = {add(num1, num2)}")
    elif choice == '2':
        print(f"{num1} - {num2} = {subtract(num1, num2)}")
    elif choice == '3':
        print(f"{num1} * {num2} = {multiply(num1, num2)}")
    elif choice == '4':
        print(f"{num1} / {num2} = {divide(num1, num2)}")
else:
    print("Invalid choice")
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