怎么说

a,b= map(int,input().split())
ans = 1
if a > 1000000000 and b>30:
    print(-1)

elif a == 1:
    print(1)

else:
  for x in range(b):
      if ans > 1000000000:
          print(-1)
          exit()
      ans *= a

  print(ans)