//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

int main() {

    while (true) {

        LL n, m;
        cin >> n >> m;
        if (!(n | m)) break;

        vector<LL> p(n);
        for (int i = 0; i < n; i++) scanf("%lld", &p[i]);
        sort(p.begin(), p.end());

        LL ans = 0;
        for (int i = 0; i < n; i++) if (p[i] <= m) ans = max(ans, p[i]);

        vector<LL> arr(n * n);
        for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) arr[i * n + j] = p[i] + p[j];
        sort(arr.begin(), arr.end());
        for (int i = 0, len = arr.size(); i < len; i++) if (arr[i] <= m) ans = max(ans, arr[i]);

        for (int i = 0; i < n; i++) {
            if (p[i] <= m) {
                auto it = upper_bound(arr.begin(), arr.end(), m - p[i]);
                if (it == arr.begin()) continue;
                ans = max(*(it - 1) + p[i], ans);
            }
        }

        for (int i = 0, len = arr.size(); i < len; i++) {
            if (arr[i] <= m) {
                auto it = upper_bound(arr.begin(), arr.end(), m - arr[i]);
                if (it == arr.begin()) continue;
                ans = max(*(it - 1) + arr[i], ans);
            }
        }

        cout << ans << endl;

    }

    return 0;
}






































Measured memory_bytes: 11288