Go: ///
// File:  0529.go
// Author: ymiyamoto
//
// Created on Wed Feb 28 20:39:28 2018
//
package main

import (
	"fmt"
	"sort"
)

func max(n, m int64) int64 {
	if n < m {
		return m
	} else {
		return n
	}
}

func main() {
	for {
		var N int
		var M int64
		fmt.Scan(&N, &M)
		if N == 0 && M == 0 {
			break
		}

		arr := make([]int64, N+1)
		for i := 1; i <= N; i++ {
			fmt.Scan(&arr[i])
		}
		sort.Slice(arr, func(i, j int) bool { return arr[i] < arr[j] })

		sums := make([]int64, len(arr)*len(arr))
		for i := 0; i < len(arr); i++ {
			for j := 0; j < len(arr); j++ {
				sums[i*len(arr)+j] = arr[i] + arr[j]
			}
		}

		sort.Slice(sums, func(i, j int) bool { return sums[i] < sums[j] })
		var m int64 = 0
		for _, val := range sums {
			rem := M - val
			if rem >= 0 {
				index := sort.Search(len(sums), func(i int) bool { return sums[i] > rem }) - 1
				if index >= 0 {
					m = max(m, val+sums[index])
				}
			}
		}
		fmt.Println(m)
	}
}

C++: //include----------------------------------------------------------------------------------------------------------------------
#include <bits/stdc++.h>
//using namespace--------------------------------------------------------------------------------------------------------------
using namespace std;

//define-----------------------------------------------------------------------------------------------------------------------
#define rep(i, n) for(int i = 0; i < (int)n; i++)
#define FOR(i, s, n) for(int i = s; i < (int)n; i++)
#define per(i, n) for(int i = n; i >= 0; i--)
#define ROF(i, s, n) for(int i = s; i >= (int)n; i--)
#define FORIT(i, A) for (auto i : A)
#define PRINT(x) cout << (x) << "\n"
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define MP make_pair
#define EACH(i, n) for (__typeof((n).begin()) i = (n).begin(); i != (n).end(); ++i)
#define SZ(a) int((a).size())
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define CLR(a) memset((a), 0 ,sizeof(a))
#define dump(x) cout << #x << " = " << (x) << "\n";
#define debug(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << "\n";
#define sq(n) (n) * (n)

//typedef----------------------------------------------------------------------------------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;
typedef vector<LL> VLL;
typedef vector<VLL> VVLL;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef priority_queue<int> maxpq;
typedef priority_queue< int, vector<int>, greater<int> > minpq;
//const------------------------------------------------------------------------------------------------------------------------
static const double EPS = 1e-10;
static const double PI = acos( -1.0 );
static const int mod = 1000000007;
static const int INF = 1 << 25;
static const LL LL_INF = 1152921504606846976;
//global-----------------------------------------------------------------------------------------------------------------------
LL n, m, ans = 0;
VLL a;
//#define DEBUG
//function-------------------------------------------------------------------------------------------------------------------
int main() {
	while ( scanf( "%lld %lld", &n, &m ) && n && m ) {
		a.resize( n );
		rep( i, n ) {
			scanf( "%lld", &a[ i ] );
		}
		ans = 0;
		sort( a.rbegin(), a.rend() );
		rep( i, n ) {
			while ( ans <= m ) {
				ans += a[ i ];
			}
			ans -= a[ i ];
		}
		printf( "%lld\n", ans );
	}
	return 0;
}

C++: #include<bits/stdc++.h>
#define INF 2000000000
#define int long long int
#define MOD 1000000007
#define pb push_back
#define cin1(n) (cin >> n)
#define cin2(a,b) (cin >> a >> b)
#define cin3(a,b,c) (cin >> a >> b >> c)
#define cout(n) (cout << n << endl)
#define rep(i,a,b) for(int i=(a);i<(b);++i)
#define fr first 
#define sc second 
#define EPS (1e-10)

using namespace std;

typedef vector<int> vi;
typedef vector< vector<int> > vvi;
typedef vector<pair<int,int>> vpii;
typedef vector<string> vs;
typedef vector<vector<string>> vss;
typedef pair<int,int> pii;

int dx[] = {1,-1,0,0};
int dy[] = {0,0,1,-1};
int n,m;
int a,b;
int p,q;


signed main() {
	
	while(1) {
		cin2(n,m);
		if (n + m == 0) break;

		vi p(n,0);
		rep(i,0,n) {
			cin1(p[i]);
		}

		rep(i,0,n) {
			rep(j,0,n) {
				if (p[i] + p[j] <= m) { 
					p.pb(p[i] + p[j]);	
				}
			}
		}
		sort(p.begin(),p.end());

		int size = p.size();

		int ans = 0;
		rep(i,0,size) {
			int c_d = p[i];
			int a_b = *(upper_bound(p.begin(),p.end(),m - c_d) - 1);
			ans = max(ans,a_b + c_d);
		}
		cout(ans);
	}



	return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
int main(){
  int n,m,p[1001],ans,yoso;
  while(cin >> n >> m){
    if(n == 0 && m == 0) break;
    vector<int> vec;
    for(int i=0;i<n;i++) cin >> p[i];
    p[n] = 0;
    for(int i=0;i<=n;i++){
      for(int j=0;j<=n;j++){
	vec.push_back(p[i]+p[j]);
      }
    }
    sort(vec.begin(),vec.end());
    ans = 0;
    for(int i=0;i<=vec.size();i++){
      yoso = upper_bound(vec.begin(),vec.end(),m-vec[i])-vec.begin()-1;
      if(yoso >= 0) ans = max(ans,vec[i] + vec[yoso]);
    }
    cout << ans << endl;
  }
  return (0);
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <functional>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <utility>
#include <sstream>
#include <complex>

using namespace std;

#define FOR(i,a,b) for(long long i=(a);i<(b);i++)
#define REP(i,N) for(long long i=0;i<(N);i++)
#define ALL(s) (s).begin(),(s).end()
#define fi first
#define se second

#define PI acos(-1.0)
#define INF 1000000007
#define EPS 1e-10
#define MAX_N 20000
#define MAX_M 16

typedef long long ll;
typedef pair<ll, ll> P;
typedef pair<double, double> PD;
typedef pair<string, ll> PS;
typedef vector<ll> V;
typedef pair<P, char> PC;

int n, m, p[1010];
int dp[5][1010];

int main(){
	while (cin >> n >> m&&n + m){
		fill(p, p + 1010, -1);
		p[0] = 0;
		FOR(i, 1, n + 1)cin >> p[i];
		sort(p, p + 1010, greater<int>());
		int ans = 0;
		REP(i, 4){
			REP(j, n + 1){
				if (ans + p[j] <= m){
					ans += p[j];
					break;
				}
			}
		}
		cout << ans << endl;
	}
}

C++: //http://judge.u-aizu.ac.jp/onlinejudge/review.jsp?rid=2676345#1
//http://judge.u-aizu.ac.jp/onlinejudge/review.jsp?rid=2676345#1
#include <iostream>
#include<cstdlib>
#include<queue>
#include<set>
#include<vector>
#include<string>
#include<algorithm>
#include<stack>
#include<map>
#include<cstdio>
#include<fstream>
#include<cstring>
using namespace std;
#define rep(i,a) for(int i=0;i<a;i++)
#define mp make_pair
#define P pair<int,int>
#define ll __int64

int n,m;
int t[10000];
const int MA=1000000;
int s1[MA],s2[MA];

int ya[4];

int main(){

while(cin>>n>>m,n||m){
//rep(i,MA)s1[i]=s2[i]=0;
rep(i,10000)t[i]=0;
for(int i=1;i<=n;i++)cin>>t[i];
for(int i=0;i<=n;i++){
	for(int j=0;j<=n;j++){
		s1[i*(n+1)+j]=t[i]+t[j];
		s2[i*(n+1)+j]=t[i]+t[j];
	}
}
int g=(n+1)*(n+1);

sort(s1,s1+g);
sort(s2,s2+g);

//rep(i,g)cout<<s1[i]<<" ";cout<<endl;

int ans=0;

for(int i=0;i<g;i++){
	int now=s1[i];

	int l=0;
	int r=g-1;
	int mid=(l+r)/2;
	int x=s2[mid];

	for(int i=0;i<100;i++){
		if(x+now==m)break;
		if(x+now>m){
			r=mid;
			mid=(r+l)/2;
			x=s2[mid];
		}
		else{
			l=mid;
			mid=(r+l)/2;
			x=s2[mid];
		}
	}

	//cout<<" "<<x<<" "<<now<<" "<<x+now<<endl;
	if(x+now<=m)
	ans=max(ans,x+now);
}
cout<<ans<<endl;
}
	return 0;
}