E

#include <bits/stdc++.h>


using namespace std;

#define int long long

const long long INF = 1e9 + 7;
const int MAXN = 200 + 10;
const int N = 1e5 + 10;

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int n, s;
    cin >> n >> s;
    vector<int> w(n), c(n);
    for (int i = 0; i < n; ++i) {
        cin >> w[i];
    }
    for (int i = 0; i < n; ++i) {
        cin >> c[i];
    }
    int ans = 0, sum = 0, l = 0, cost = 0;
    for (int r = 0; r < n; ++r) {
        sum += w[r];
        cost += c[r];
        while (sum > s && l <= r) {
            sum -= w[l];
            cost -= c[l];
            ++l;
        }
        ans = max(ans, cost);
    }
    cout << ans << '\n';
}