#include <bits/stdc++.h>
#define show(x) std::cerr << #x << " = " << x << std::endl
using ll = long long;
int main()
{
    int N;
    ll M;
    std::cin >> N >> M;
    std::vector<int> A(N);
    std::vector<ll> K(N);
    for (int i = 0; i < N; i++) { std::cin >> A[i]; }
    int max = 0;
    for (int i = 0; i < N; i++) { std::cin >> K[i], M -= K[i] * A[i], max = std::max(max, A[i]); }
    M = -M;
    ll ans = (std::max(0LL, M - max * max + max + 1) / max);
    M -= ans * max;
    std::vector<int> memo(max * max, max * max);
    auto dp = [&](auto&& self, const ll M) -> int {
        if (M == 0) { return 0; }
        if (M < 0) { return max * max; }
        if (memo[M] != max * max) { return memo[M]; }
        int ans = max * max;
        for (const ll a : A) { ans = std::min(ans, self(self, M - a)); }
        return memo[M] = ans + 1;
    };
    const int add = dp(dp, M);
    if (add >= max * max) { return std::cout << -1 << std::endl, 0; }
    std::cout << ans + add << std::endl;
    return 0;
}