import sys
T = int(input())
for i in range(T):
	N = int(input())
	if N == 0:
		print(2)
		continue
	temp = 1
	ans = 0
	for i in range(N, -1, -1):
		ans = (ans + temp) % 10
		temp = (temp * i) % 10
		if temp == 0:
			break
	print(ans)