import time
lst = ["Вася", "1"]	


def concat(n):
	start = time.time()
	s = ""
	for i in range(n):
		s += "Вася" + "1"
	end = time.time()
	print("%d strings concatenated in %.3f seconds" % (n, end - start))


def join(n):
	start = time.time()
	for i in range(n):
		s = "".join(lst)
	end = time.time()
	print("%d strings joined in %.3f seconds" % (n, end - start))



concat(3000000)
join(3000000)