def add2(n1, n2):
	s = n1 + n2
	return s

	print add2(3, 4)
	
def add3(n1, n2, n3):
	s = n1 + n2 + n3
	return s

	print add3(3, 4, 5)

def add4(n1, n2, n3 ,n4):
	s = n1 + n2 + n3 + n4 
	return s

	print add2(3, 4, 5, 6)
	
