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

int N = 0, M = 0;
int points[1001];
int scores[1002001];

bool check(int a, int c){
    if(a >= (N + 2) * (N + 1) / 2 - 1){
        return true;
    }
    return (scores[a] <= c && scores[a + 1] > c);
}

int search2(int a, int b, int c){
    int pib = a + b - b / 2;
    if(check(pib, c)){
        return pib;
    }else if(scores[pib] < c){
        return search2(pib, b / 2, c);
    }else{
        return search2(a, b / 2, c);
    }
}

int main(){
    for(;;){
        for(int i = 0; i < 1001; i++){
            points[i] = 0;
        }
        for(int i = 0; i < 1002001; i++){
            scores[i] = 0;
        }
        if(cin >> N){
            if(N == 0){
                break;
            }
            cin >> M;
            for(int i = 1; i <= N; i++){
                cin >> points[i];
            }
            for(int i = 0; i <= N; i++){
                for(int j = i; j <= N; j++){
                    scores[(2 * N - i + 1) * i / 2 + j] = points[i] + points[j];
                }
            }
            int mxsco = 0;
            sort(scores, scores + ((N + 2) * (N + 1)) / 2);
            for(int i = 0; i < (N + 2) * (N + 1) / 2; i++){
                if(scores[i] > M){
                    break;
                }
                int nosco = scores[i] + scores[search2(0, (N + 2) * (N + 1) / 2, M - scores[i])];
                if(nosco >= mxsco &&  nosco <= M){
                    mxsco = nosco;
                }
            }
            cout << mxsco << endl;
        }else{
            break;
        }
    }
    return 0;
}
#include <iostream>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <algorithm>
#include <cstdio>
#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define FORR(i, m, n) for(int i = m;i >= n;i--)
#define SORT(v, n) sort(v, v+n);
#define VSORT(v) sort(v.begin(), v.end());
#define llong long long
#define pb(a) push_back(a)
#define INF 999999999
using namespace std;
typedef pair<int, int> P;

int dy[]={0, 0, 1, -1};
int dx[]={1, -1, 0, 0};

int n;
llong m;

int main(){
	while(1){
		scanf("%d%lld", &n, &m);
		if(n==0 && m==0) return 0;
		n++;
		vector<llong> p(n);
		p[0]=0;
		FOR(i, 1, n) scanf("%lld", &p[i]);
		VSORT(p);
		int size=0;
		vector<llong> v;
		REP(i, n){
			REP(j, n){
				v.push_back(p[i]+p[j]);
			}
		}
		VSORT(v);
		llong ans=0;
		REP(i, v.size()){
			int rem=m-v[i];
			if(rem < 0) continue;
			int l=0, r=v.size();

			while(l<r){
				int mid=(l+r)/2;
				if(rem>v[mid]){
					l=mid+1;
				}
				else if(rem<v[mid]){
					r=mid;
				}
				else {
					break;
				}
			}

			ans = max(ans, v[i]+v[r-1]);
		}

		printf("%d\n",ans);
	}
}