N=int(input())
M=int(input())
a=1
N%=10
c=0
T=[0]*10
S=[0]*10
while M>=0 and T[a]<2:
    a*=N
    a%=10
    M-=1
    T[a]+=1
    c+=1
    if S[a]==0:
        S[a]=c
 #   print (a)
#rint (M)
if M==0:
    print(a)
else:
    M+=c-S[a]+1
  #  print (M)
    M%=c-S[a]+1
#    print (M)
    while M>0:
        a*=N
        a%=10
        M-=1
    print (a)