#include "bits/stdc++.h"
using namespace std;
int dp[1001][100001];
vector <int >price, page;
int state(int index, int total)
{
if (index < 0) return 0;
if (dp[index][total] != -1) return dp[index][total];
int &ans = dp[index][total];
if (total >= price[index]) {
ans = page[index] + state(index - 1, total - price[index]);
}
ans = max(ans, state(index - 1, total));
return ans;
}
int main() {
ios::sync_with_stdio(false); cin.tie(nullptr);
int n, req; cin >> n >> req;
price.resize(n); page.resize(n);
for (auto &x : price) cin >> x;
for (auto &x : page) cin >> x;
memset(dp, -1, sizeof(dp));
cout << state(n - 1, req);