#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
//using mint = modint998244353;
//const int mod = 998244353;
//const int INF = 1e9;
const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
#define P pair<int,int>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
long long dp[2501][50][50];//長さ,last2,last1
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int n, c; cin >> n >> c;
	vector<int>s(n), w(n);
	rep(i, n)cin >> s[i];
	rep(i, n)cin >> w[i];
	rep(i, 2501)rep(j, 50)rep(k, 50)dp[i][j][k] = LINF;
	rep(i, n)rep(j, n)rep(k, n) {
		if (s[i] == s[j])continue;
		if (s[i] == s[k])continue;
		if (s[j] == s[k])continue;
		if ((s[i] < s[j]) && (s[j] <= s[k]))continue;
		if ((s[i] > s[j]) && (s[j] >= s[k]))continue;
		if (w[i] + w[j] + w[k] > c)continue;
		dp[s[i] + s[j] + s[k]][j][k] = w[i] + w[j] + w[k];
	}
	rep(i, 2501)rep(j, n)rep(k, n) {
		if (LINF == dp[i][j][k])continue;
		rep(l, n) {
			if (s[j] == s[l])continue;
			if (s[k] == s[l])continue;
			if ((s[j] < s[k]) && (s[k] <= s[l]))continue;
			if ((s[j] > s[k]) && (s[k] >= s[l]))continue;
			int ni = i + s[l];
			long long nv = dp[i][j][k] + w[l];
			if (nv > c)continue;
			chmin(dp[ni][k][l], nv);
		}
	}
	int ans = 0;
	rrep(i, 2501) {
		rep(j, n)rep(k, n) {
			if (LINF == dp[i][j][k])continue;
			chmax(ans, i);
		}
	}
	cout << ans << endl;
	return 0;
}