#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <array>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
#include <memory>
#include <regex>
using namespace std;

const int LEN = 50;

bool isKadomatsu(int a, int b, int c)
{
    return a != c && ((b < a && b < c) || (b > a && b > c));
}

int main()
{
    int n, c;
    cin >> n >> c;
    vector<int> l(n), w(n);
    for(int i=0; i<n; ++i)
        cin >> l[i];
    for(int i=0; i<n; ++i)
        cin >> w[i];

    vector<vector<vector<int> > >
        dp(c+1, vector<vector<int> >(LEN+1, vector<int>(LEN+1, -1)));
    for(int i=0; i<n; ++i){
        for(int j=0; j<n; ++j){
            if(w[i] + w[j] <= c && l[i] != l[j])
                dp[c-w[i]-w[j]][l[i]][l[j]] = l[i] + l[j];
        }
    }

    int ans = 0;
    for(int x=c; x>0; --x){
        for(int a=1; a<=LEN; ++a){
            for(int b=1; b<=LEN; ++b){
                for(int i=0; i<n; ++i){
                    if(dp[x][a][b] == -1 || x < w[i] || !isKadomatsu(a, b, l[i]))
                        continue;
                    dp[x-w[i]][b][l[i]] = max(dp[x-w[i]][b][l[i]], dp[x][a][b] + l[i]);
                    ans = max(ans, dp[x-w[i]][b][l[i]]);
                }
            }
        }
    }
    cout << ans << endl;

    return 0;
}