num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
operator = input("Enter operator (+, -, *, /): ")

if operator == '+':
    result = num1 + num2
elif operator == '-':
    result = num1 - num2
elif operator == '*':
    result = num1 * num2
elif operator == '/':
    if num2 == 0:
        print("Error: Division by zero")
    else:
        result = num1 / num2
else:
    print("Invalid operator")
    result = None

if result is not None:
    print("Result:", result)