def main() -> None:
  N, M = (int(elt) for elt in input().split())
  A = [int(elt) for elt in input().split()]
  K = [int(elt) for elt in input().split()]
  tot = sum(a * k for (a, k) in zip(A, K)) - M
  # print(f"DEBUG: tot={tot}")
  MAX_V = A[N - 1] * A[N -  1]
  INF = 10**18
  dp = [INF] * (MAX_V + 1)
  dp[0] = 0
  for i in range(N):
    for j in range(MAX_V + 1):
      if j - A[i] >= 0:
        dp[j] = min(dp[j], dp[j - A[i]] + 1)
  # print(f"DEBUG: dp={dp}")
  ans = INF
  for j in range(MAX_V + 1):
    if dp[j] == INF:
      continue
    rem = tot - j
    if rem >= 0 and rem % A[N - 1] == 0:
      ans = min(ans, dp[j] + (rem // A[N - 1]))
  if ans == INF:
    ans = -1
  print(ans)
  return


if __name__ == '__main__':
  main()