#include<iostream>
#include<string>
#include<algorithm>
#include<cmath>
#include<vector>

using namespace std;

int main() {
	int n[1000], m[1000], p[10][1000],ans=0, i = 0;
	vector<int> v;
	while (cin >> n[i] >> m[i]) {
		if (n[i] == 0)break;
		for (int j = 0; j < n[i]; j++)cin >> p[i][j];
		i++;
	}
	for (int k = 0; k < i; k++) {
		ans = 0;
		v = vector<int>(1,0);
		for (int a = 0; a < n[k]; a++) {
			v.push_back(p[k][a]);
			for (int b = 0; b < n[k]; b++)
				v.push_back(p[k][a] + p[k][b]);
		}
		sort(v.begin(), v.end());
		for (int j = 0; j < v.size(); j++) {
			if (v[j] > m[k])break;
			decltype(v)::iterator itr= upper_bound(v.begin(), v.end(), m[k]-v[j]);
			itr--;
			ans = max(ans, v[j] + *itr);
		}
		cout << ans << endl;
	}
	return 0;
} 