simple calculator

def add(num1, num2):
	return num1 + num2
def subtract(num1, num2):
	return num1 - num2
def multiply(num1, num2):
	return num1 * num2
def divide(num1, num2):
	return num1 / num2
print("Please select operation -\n" 
		"1. Add\n" 
		"2. Subtract\n" 
		"3. Multiply\n" 
		"4. Divide\n")
select = int(input("Select operations form 1, 2, 3, 4 :"))
number_1 = int(input("Enter first number: "))
number_2 = int(input("Enter second number: "))
if select == 1:
	print(number_1, "+", number_2, "=",
					add(number_1, number_2))
elif select == 2:
	print(number_1, "-", number_2, "=",
					subtract(number_1, number_2))
elif select == 3:
	print(number_1, "*", number_2, "=",
					multiply(number_1, number_2))
elif select == 4:
	print(number_1, "/", number_2, "=",
					divide(number_1, number_2))
else:
	print("Invalid input")