//  Book Shop

#include<bits/stdc++.h>

using namespace std;

int main() {
    int n, x; cin >> n >> x;
    vector<int> price(n);
    vector<int> pages(n);
    for (auto &e: price) cin >> e;
    for (auto &e: pages) cin >> e;

    int dp[1000001];
    for (int i{}; i < n; i++) {
        for (int j = x; j >= price[i]; j--) {
            dp[j] = max(dp[j], dp[j - price[i]] + pages[i]);
        }
    }

    cout <<  dp[x] << endl;

    return 0;
}