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;
vector<long int> po;
vector <pair <int ,long int> > sss;
long int n,a,low,m,lastans,memo[200000000];
void solve(int dp,long int sum);

int main(){
    while(1){
        lastans=0;
        po.clear();
        //for(int i=0;i<1005;i++)memo[i]=0;

        cin >> n >> m;
        if(n==0&&m==0)break;
        for(int i=0;i<n;i++){
            cin >> a;
            po.push_back(a);
           // low=min(low,a);
        }
        sort(po.begin(),po.end());
        //cout << po[0] << endl;
        //solve(0,0);
        //lastans=po[n-1];

        for(int i=4;i>0;i--){
            for(int j=n-1;j>=0;j--){
                if(m>=i*po[j]){
                    lastans=max(i*po[j],lastans);

                    for(int k=4-i;i>0;i--){
                        for(int s=0;s<n;s++){
                            if(m>=i*po[j]+po[s]){
                                lastans=max(i*po[j]+po[s],lastans);

                                for(int t=4-k;t>0;t--){
                                    for(int u=0;u<n;u++){
                                        if(m>=i*po[j]+po[s]+po[u]){
                                         lastans=max(i*po[j]+po[s]+po[u],lastans);

                                         for(int v=4-t;v>0;v--){
                                            for(int w=u-1;w>=0;w--){
                                                if(m>=i*po[j]+po[s]+po[u]+po[w]){
                                                    lastans=max(lastans,i*po[j]+po[s]+po[u]+po[w]);
                                                    //break;
                                                }else break;
                                            }
                                         }
                                            //break;
                                        }else break;
                                    }
                                }
                                //break;
                            }else break;

                        }
                    }

                    //lastans=max(lastans,po[j]*i);
                    //break;
                }else break;
            }
        }



        cout << lastans << endl;
        //cout <<"ss=" << ss << endl;
    }

    return 0;
}

C++: #include <cstdio>
#include <algorithm>
int a[1001],b[510001],*p;main(){
	int n,m,i,j,k,r;
	for(;scanf("%d%d",&n,&m)>1&&n;printf("%d\n",r)){
		for(i=1;i<=n;i++)scanf("%d",a+i);
		for(k=i=0;i<=n;i++)for(j=i;j<=n;j++)b[k++]=a[i]+a[j];
		std::sort(b,b+k);
		for(r=i=0;b[i]<=m&&i<k;i++){
			p=std::upper_bound(b,b+k,m-b[i]);
			if(p>b&&r<b[i]+*(p-1))r=b[i]+*(p-1);
		}
	}
}

C++: #include<iostream>
#include<vector>
#include<algorithm>
using namespace std;

vector<long long>F1;
vector<long long>F2;

long long n,m;
long long a[10000];
long long maxn;
long long l,r,M;

int main(){
	while(true){
		maxn=0;
		cin>>n>>m;
		if(n==0 && m==0){break;}
		for(int i=0;i<n;i++){
			cin>>a[i];
		}
		F1.clear();
		F2.clear();
		for(int i=0;i<n;i++){
			for(int j=0;j<n;j++){
				F1.push_back(a[i]+a[j]);
			}
		}
		for(int i=0;i<n;i++){
			for(int j=0;j<n;j++){
				F2.push_back(a[i]+a[j]);
			}
		}
		sort(F2.begin(),F2.end());
		for(int i=0;i<F1.size();i++){
			if(F1[i]<=m){
				l=0;r=F2.size();
				for(int j=0;j<50;j++){
					M=(l+r)/2;
					if(F1[i]+F2[M]>m){
						r=M;
					}
					else if(M==F1.size()-1){
						l=M;
					}
					else if(F1[i]+F2[M+1]<=m){
						l=M;
					}
				}
				maxn=max(maxn,F1[i]+F2[M]);
			}
		}
		cout<<maxn<<endl;
	}
	return 0;
}

C++: #include <iostream>
#include <algorithm>

#define rep(i,n) for(int i=0;i<n;++i)
using namespace std;
using ll=long long;


int main(void){
	ll n,m;
	while(cin >> n >> m,n){
		ll p[1010];
		vector<ll> pp;

		rep(i,n) cin >> p[i];
		p[n]=0;
		
		rep(i,n+1)rep(j,n+1) pp.emplace_back(p[i]+p[j]);
		sort(pp.begin(),pp.end());

		ll ans=0LL;
		for(auto &i:pp){
			ll j=pp[upper_bound(pp.begin(),pp.end(),m-i)-pp.begin()-1];
			if(i+j>m) continue;
			ans=max(ans,i+j);
		}
		cout << ans << endl;
	}
	return 0;
}

C++: 
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main()
{
	int ans[4];
	int temp;
	double energy,energy_min,energy_now;
	int M, N;
	int* p;
	int i, j;
	double T=100;
	int ret;
	while (1) {
		scanf("%d%d", &N, &M);
		p = (int*)malloc((N+1) * sizeof(int));
		for (i = 0; i < N; i++) {
			scanf("%d", &p[i]);
		}
		p[N] = 0;
		if (N == M && N == 0) {
			break;
		}
		energy_min = pow(10, 300);
		for (j = 0; j < 4; j++) {
			ans[j] = p[(int)((double)(rand() + 1) / (RAND_MAX + 2)*(N+1))];
		}
		
		for (T = 1000000; T > 100; T--) {
			for (j = 0; j < 4; j++) {
				temp = p[(int)((double)(rand() + 1) / (RAND_MAX + 2)*(N+1))];
				for (j = 0; j < 4; j++) {
					ret = ans[0] + ans[1] + ans[2] + ans[3];
					ret += temp - ans[j];
					energy = M - ret;
					if (M < ret)energy += 100000000;

					if (energy < energy_min) {
						energy_min = energy;
						ans[j] = temp;
					}
					else if ((double)(rand() + 1) / (RAND_MAX + 2) < exp((energy_min - energy) / T*10)) {
						energy_min = energy;
						ans[j] = temp;
					}
				}

			}
		}
		ret=ans[0]+ +ans[1] + ans[2] + ans[3];
		printf("%d\n", ret);
	}
    return 0;
}

C++: #include "bits/stdc++.h"
#define in std::cin
#define out std::cout
#define rep(i,N) for(LL i=0;i<N;++i)
typedef long long int LL;
  
int32_t N, M, P[1123];
std::set<int32_t>list;
int32_t ans;
  
int main()
{
    while (true)
    {
        N = M = 0;
        memset(P, 0, sizeof(P));
        list.clear();
        ans = 0;
  
        in >> N >> M;
        if (N == 0 && M == 0) { break; }
        rep(i, N) { in >> P[i]; }
  
        P[N] = 0;
        N++;
        //std::sort(P, P + N);
        rep(i, N)
        {
            rep(j, N) { list.insert(P[i] + P[j]); }
        }
        for (auto& i : list)
        {
            if (i > M) { break; }
            auto iter = list.upper_bound(M - i);
            --iter;
            ans = std::max(ans, i + *iter);
        }
  
        out << ans << std::endl;
    }
    return 0;
}