SN = input()
SM = input()

N = int(SN[-1])

if SM == '0':
    ans = 1
else:
    if N==0:
        ans = 0
    elif N==1:
        ans = 1 
    elif N==2:
        x = int(SM[-2:])
        ans = [6,2,4,8][x%4]
    elif N==3:
        x = int(SM[-2:])
        ans = [1,3,9,7][x%4]
    elif N==4:
        x = int(SM[-1])
        ans = [6,4][x%2]
    elif N==5:
        ans = 5
    elif N==6:
        ans = 6
    elif N==7:
        x = int(SM[-2:])
        ans = [1,7,9,3][x%4]
    elif N==8:
        x = int(SM[-2:])
        ans = [6,8,4,2][x%4]
    elif N==9:
        x = int(SM[-1])
        ans = [1,9][x%2]

print(ans)