def add(a, b):
	return a + b

def sub(a, b):
	return a - b

def mul(a, b):
	return a * b

def div(a, b):
    return a / b

if __name__ == "__main__":
	a = 6
	b = 3
	print(add(a,b))
	print(sub(a,b))
	print(mul(a,b))
	print(div(a,b))

