#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int n, c;
int L[55], W[55];
int dp[55][55][55];

int solve(int i, int j, int x) {
    int& res = dp[i][j][x];
    if (res >= 0) return res;

    res = 0;
    for (int k = 0; k < n; k++) {
        if (L[i] == L[k] || L[j] == L[k]) continue;
        if (min({L[i], L[j], L[k]}) != L[j] && max({L[i], L[j], L[k]}) != L[j]) continue;
        if (x < W[k]) continue;
        res = max(res, L[k] + solve(j, k, x - W[k]));
    }
    return res;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> n >> c;
    for (int i = 0; i < n; i++) {
        cin >> L[i];
    }
    for (int i = 0; i < n; i++) {
        cin >> W[i];
    }
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (L[i] == L[j]) continue;
            for (int k = 0; k <= c - W[i] - W[j]; k++) {
                dp[i][j][k] = -1;
            }
        }
    }

    int ans = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if (L[i] == L[j]) continue;
            if (c < W[i] + W[j]) continue;
            int tmp = solve(i, j, c - W[i] - W[j]);
            if (tmp == 0) continue;
            ans = max(ans, tmp + L[i] + L[j]);
        }
    }
    cout << ans << endl;
    return 0;
}