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(3,4,1)

def add4(n1, n2,n3,n4):
	s = n1 + n2 +n3 +n4
	return s
	print add4(3,4,1,2)
