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

import (
	"fmt"
	"sort"
)

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

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

		arr := make([]int, N+1)
		for i := 1; i <= N; i++ {
			fmt.Scan(&arr[i])
		}
		sort.Ints(arr)

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

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

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

#define pb(n) push_back(n)
#define fi first
#define se second
#define all(r) (r).begin(),(r).end()
#define gsort(st,en) sort((st),(en),greater<int>())
#define vmax(ary) *max_element(all(ary))
#define vmin(ary) *min_element(all(ary))
#define debug(x) cout<<#x<<": "<<x<<endl
#define fcout(n) cout<<fixed<<setprecision((n))
#define scout(n) cout<<setw(n)
#define vary(type,name,size,init) vector< type> name(size,init)

#define rep(i,n) for(int i = 0; i < (int)(n);++i)
#define REP(i,a,b) for(int i = (a);i < (int)(b);++i)
#define repi(it,array) for(auto it = array.begin(),end = array.end(); it != end;++it)
#define repa(n,array) for(auto &n :(array))

using ll = long long;
using vi = vector<int>;
using vl = vector<ll>;
using dict = map<string,int>;
using pii = pair<int,int> ;
using pll = pair<ll,ll> ;

const int mod = 1000000007;
constexpr int imax = ((1<<30)-1)*2+1 ;
constexpr int inf = 100;
constexpr double PI = acos(-1.0) ;
double eps = 1e-10 ;
const int dy[] = {-1,0,1,0};
const int dx[] = {0,-1,0,1};

inline bool value(int x,int y,int w,int h){
  return (x >= 0 && x < w && y >= 0 && y < h);
}

template<typename T>
void Unique(vector<T> &v){
  sort(all(v));
  v.erase(unique(all(v)),v.end());
}

template<typename T>
T ston(string& str, T n){
  istringstream sin(str) ;
  T num ;
  sin >> num ;
  return num ;
}

void Ans(bool f){
  if(f) cout << "YES"<<endl;
  else cout << "NO"<<endl;
}

vector<vector<ll>> dp;
int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  ll n,m;
  while(cin >> n >> m && n && m){
    vary(ll,s,n,0);
    dp = dp(n+2,vector<ll>(m+2,inf));
    rep(i,n){
      cin >> s[i];
    }
    sort(all(s));
    rep(i,m+1){
      dp[0][i] = 0;
    }
    rep(i,n+1){
      dp[i][0] = 0;
    }
    REP(i,0,n){
      for(ll j = 0; j < m+1 + s[i]; j += s[i]){
        if(j - s[i] >= 0){
          dp[i+1][j] = min(dp[i+1][j],dp[i][j-s[i]]+1);
        }
      }
      if(i > 0){
        rep(j,m+1){
          dp[i+1][j] = min(dp[i][j],dp[i+1][j]);
        }
      }
    }
    ll ans = 0;
    for(ll j = n; j >= 0; --j){
      for(ll i = m; i >= 0; --i){
        if(dp[j][i] != inf && dp[j][i] != 0 && dp[j][i] <= m){
          ans = i;
          j = -1;
          break;
        }
      }
    }
    cout << ans << endl;
  }
  return 0;
}

C++: #include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <map>
#include <sstream>
#include <queue>
#include <cstdlib>
#include <algorithm>
#include <iterator>
#include <stack>
#include <list>
using namespace std;
#define INF 100000000
typedef long long int lli;
typedef pair<int,int> P;

int p[1000];
int dp[5][1000];

int main(){
	int n,m;
	while(cin>>n>>m){
		if(n==0&&m==0) break;
		for(int i=0; i<n; ++i){
			cin >> p[i];
		}
		for(int i=0; i<5; ++i){
			for(int j=0; j<n; ++j){
				dp[i][j]=0;
			}
		}
		for(int i=0; i<n; ++i){
			if(p[i]<=m) dp[1][i]=p[i];
		}
		for(int i=2; i<5; ++i){
			for(int j=0; j<n; ++j){
				for(int k=0; k<n; ++k){
					if(dp[i-1][k]+p[j]<=m) dp[i][j]=max(dp[i][j],dp[i-1][k]+p[j]);
				}
			}
		}
		int ans=0;
		for(int i=0; i<5; ++i){
			for(int j=0; j<1000; ++j){
				ans=max(ans,dp[i][j]);
			}
		}
		cout << ans << "\n";
	}
	return 0;
}

C++: #include <vector>
#include <algorithm>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstring>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
typedef double db;

#define fr first
#define sc second
#define pb push_back
#define rep(i,x) for(ll i=0;i<x;i++)
#define rep1(i,x) for(ll i=1;i<=x;i++)
#define rrep(i,x) for(ll i=x-1;i>=0;i--)
#define rrep1(i,x) for(ll i=x;i>0;i--)

ll n,m;
ll p[1000];
vector<ll> v;
int main()
{while(1){
	v.clear();
	cin>>n>>m;
	if(!n) break;
	p[0]=0;
	rep1(i,n) cin>>p[i];
	rep(i,n+1) rep(j,n+1){
		v.pb(p[i]+p[j]);
	}
	sort(v.begin(),v.end());
	ll ans=0;
	//ans=v[upper_bound(v.begin(),v.end(),m)-v.begin()-1];
	rep(i,n+1) rep(j,n+1){
		if(p[i]+p[j]<=m) ans=max(ans,v[upper_bound(v.begin(),v.end(),m-p[i]-p[j])-v.begin()-1]+p[i]+p[j]);
	}
	//for(ll i=n/2;i<n;i++) if(p[i]<=m) ans=max(ans,v[upper_bound(v.begin(),v.end(),m-p[i])-v.begin()-1]+p[i]);
	//for(ll i=n/2;i<n;i++) for(ll j=i+1;j<n;j++) if(p[i]+p[j]<=m) ans=max(ans,v[upper_bound(v.begin(),v.end(),m-p[i]-p[j])-v.begin()-1]+p[i]+p[j]);
	cout<<ans<<endl;
}}

C++: #include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <climits>
#include <cfloat>
#include <ctime>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <numeric>

using namespace std;

#ifdef _MSC_VER
#define __typeof__ decltype

template <class T>
int __builtin_popcount(T n) { return n ? 1 + __builtin_popcount(n & (n - 1)) : 0; }
#endif

#define foreach(it, c) for (__typeof__((c).begin()) it=(c).begin(); it != (c).end(); ++it)
#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define popcount __builtin_popcount

template <class T> void max_swap(T& a, const T b) { a = max(a, b); }
template <class T> void min_swap(T& a, const T b) { a = min(a, b); }

const double EPS = 1e-10;
typedef long long ll;
typedef pair<int, int> pint;


int main()
{
	int n;
	ll m;
	while (scanf("%d%I64d", &n, &m), n | m)
	{
		ll p[1024];
		for (int i = 0; i < n; ++i)
			scanf("%I64d", p + i);
		p[n] = 0;
		vector<ll> two;
		for (int i = 0; i <= n; ++i)
			for (int j = i; j <= n; ++j)
				two.push_back(p[i] + p[j]);
		sort(all(two));

		ll res = 0;
		foreach (it, two)
		{
			int k = lower_bound(all(two), m - *it) - two.begin();
			--k;
			if (k >= 0)
				max_swap(res, *it + two[k]);
		}
		printf("%I64d\n", res);
	}
}

C++: #include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> P;
typedef vector<int> VI;
typedef vector<VI> VVI;
const double PI = 3.14159265358979323846;
const double EPS = 1e-12;
const int INF = numeric_limits<int>::max() / 2;
const int NEG_INF = numeric_limits<int>::min() / 2;
const int MOD=1e9+7;

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);

  while(true){
      ll n,m;cin>>n>>m;
      if(n==0&&m==0) break;
      std::vector<ll> v(n);
      for(int i=0;i<n;i++) cin>>v[i];
      v.push_back(0);
      ll ma=-1;
      sort(v.begin(),v.end());
      for(int i=0;i<=n;i++){
          if(v[i]>m) continue;
          for(int j=0;j<=n;j++){
              if(v[i]+v[j]>m) continue;
              for(int k=0;k<=n;k++){
                  if(v[i]+v[j]+v[k]>m) continue;
                  for(int l=0;l<=n;l++){
                      ll sum=v[i]+v[j]+v[k]+v[l];
                      if(sum<=m) ma=max(ma,sum);
                  }
              }
          }
      }
      cout<<ma<<endl;
  }
}