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#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
using namespace std; void _main(); int main() { cin.tie(0); ios::sync_with_stdio(false); _main(); }
//---------------------------------------------------------------------------------------------------



typedef long long ll;
int N, A[505];
ll M, K[505];
//---------------------------------------------------------------------------------------------------
#define INF INT_MAX/2
int dp[1010101]; int ma;
void makedp() {
    ma = A[N - 1];
    rep(i, 0, ma*ma) dp[i] = INF;
    dp[0] = 0;
    rep(i, 1, ma*ma) rep(j, 0, N - 1) {
        int ii = i - A[j];
        if (0 <= ii) dp[i] = min(dp[i], dp[ii] + 1);
    }
}
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N >> M;
    rep(i, 0, N) cin >> A[i];
    rep(i, 0, N) cin >> K[i];

    makedp();

    ll sm = 0;
    rep(i, 0, N) sm += A[i] * K[i];

    ll d = sm - M;
    if (d < 0) {
        printf("-1\n");
        return;
    }

    ll rest = d % (ma * ma);
    ll ans = (d - rest) / ma;
    if (dp[rest] == INF && dp[rest % ma] == INF) {
        printf("-1\n");
        return;
    }
    ll dd = dp[rest];
    if (rest % ma != rest) dd = min(dd, (ll)dp[rest % ma] + 1LL);
    ans += dd;
    cout << ans << endl;
}