[BOJ C#] 2798 블랙잭

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;

namespace _2798
{
    class Program
    {
        static void Main()
        {
            StreamReader sr = new StreamReader(Console.OpenStandardInput());
            StreamWriter sw = new StreamWriter(Console.OpenStandardOutput());

            string[] nm = sr.ReadLine().Split(' ');
            int n = int.Parse(nm[0]);
            int m = int.Parse(nm[1]);

            string[] cardString = sr.ReadLine().Split(' ');
            int[] cardInt = new int[cardString.Length];
            int sum = 0;
            bool blackJack = false;
            List<int> sums = new List<int>();

            for(int i = 0; i < cardString.Length; i++)
            {
                cardInt[i] = int.Parse(cardString[i]);
            }
            for(int card1 = 0; card1 < cardInt.Length-2; card1++)
            {
                for (int card2 = card1+1; card2 < cardInt.Length-1; card2++) 
                {
                    for (int card3 = card2+1; card3 < cardInt.Length; card3++)
                    {
                        sum = cardInt[card1] + cardInt[card2] + cardInt[card3];

                        if (sum == m)
                        {
                            blackJack = true;
                            break;
                        }
                        else if (sum < m)
                        {
                            sums.Add(sum);
                        }
                    }

                }
            }
            if (blackJack)
                sw.WriteLine(m);
            else
                sw.WriteLine(sums.Max());

            sr.Close();
            sw.Flush();
            sw.Close();
        }
    }
}