package net.ipipip0129.yukicoder.no617;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String line = scan.nextLine();
		int count = Integer.parseInt(line.split(" ")[0]);
		int maxweight = Integer.parseInt(line.split(" ")[1]);
		
		List<Integer> stocks = new ArrayList<Integer>();
		
		for (int i = 0; i < count; i++) {
			stocks.add(Integer.parseInt(scan.nextLine()));
		}
		
		scan.close();
		
		int cweight = 0;
		for (int i = 0; i < stocks.size(); i++) {
			if (stocks.get(i) <= maxweight) {
				cweight = stocks.get(i);
			}else {
				break;
			}
		}
		
		if (cweight != maxweight) {
			for (int i =0; i < stocks.size() / 2; i++) {
				for (int j = 0; j < stocks.size(); j++) {
					if (stocks.get(i) != stocks.get(j)) {
						if (stocks.get(i) + stocks.get(j) <= maxweight) {
							if (cweight < stocks.get(i) + stocks.get(j)) {
								cweight = stocks.get(i) + stocks.get(j);
							}
						}
					}
				}
			}
		}
		System.out.println(cweight);
	}
}