n=int(input())
m=int(input())
n%=10
ans=[]
cnt=1
if m==0:
  print(1)
  exit()
for i in range(11):
  cnt*=n
  cnt%=10
  if cnt not in ans:
    ans.append(cnt)
  else:
    l=ans.index(cnt)
    r=i
    if m<=l:
      print(ans[m-1])
    else:
      b=m%(r-l)
      print(ans[b+l-1])
    break