#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main(){
    int n, c; cin >> n >> c;
    vector<int> l(n);
    for(auto &it: l) cin >> it;
    vector<int> w(n);
    for(auto &it: w) cin >> it;

    vector<vector<vector<int>>> dp(c+10, vector<vector<int>>(60, vector<int>(60, -(1 << 30))));
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            if(l[i] == l[j] || c < w[i]+w[j]) continue;
            dp[w[i]+w[j]][l[i]][l[j]] = max(dp[w[i]+w[j]][l[i]][l[j]] ,l[i]+l[j]);
        }
    }
    for(int i = 0; i <= c; i++){
        for(int j = 0; j < 60; j++){
            for(int k = 0; k < 60; k++){
                if(dp[i][j][k] < 0) continue;
                for(int ii = 0; ii < n; ii++){
                    if(j != k && j != l[ii] && k != l[ii]
                    && i+w[ii] <= c
                    && (max({j, k, l[ii]}) == k || min({j, k, l[ii]}) == k)){
                        dp[i+w[ii]][k][l[ii]] = max(dp[i+w[ii]][k][l[ii]], dp[i][j][k]+l[ii]);
                    }
                }
            }
        }
    }

    int ans = 0;
    for(int i = 0; i <= c; i++){
        for(int j = 0; j < 60; j++){
            for(int k = 0; k < 60; k++) ans = max(ans, dp[i][j][k]);
        }
    }
    cout << ans << endl;
    return 0;
}