def solve():
    N=int(input())

    if N==0:
        return 2

    T=0
    X=1
    for i in range(10):
        T+=X
        X*=N-i; X%=10
    return T%10

#==================================================
import sys
input=sys.stdin.readline
write=sys.stdout.write

T=int(input())
write("\n".join(map(str,[solve() for t in range(T)])))