#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);