#include <stdio.h>
#include <iostream>
#include <algorithm>
#define MAX 1000000

using namespace std;
int v[100], help[MAX];

int main()
{
  FILE *fin, *fout;
  int n, s, i, j, l, m, semafor;

  fin = fopen("loto.in", "r");
  fout = fopen("loto.out", "w");
  fscanf(fin, "%d%d", &n, &s);
  for(i = 0; i < n; i++)
    fscanf(fin, "%d", &v[i]);
  m = 0;
  for(i = 0; i < n; i++)
    for(j = 0; j < n; j++)
      for(l = 0; l < n; l++)
      {
        help[m] = v[i] + v[j] + v[l];
        m++;
      }
  sort(help, help + m);
  semafor = 0;
  i = 0;
  j = m - 1;
  while(semafor == 0 && i < m && j >= 0)
  {
    if(help[i] + help[j] < s)i++;
    else if(help[i] + help[j] > s)j--;
    else
    {
      //fprintf(fout, "%d %d %d %d %d %d", help[i].a, help[i].b, help[i].c, help[j].a, help[j].b, help[j].c);
      semafor = 1;
    }
  }
  if(semafor == 0)fprintf(fout, "%d", -1);
  fclose( fin );
  fclose( fout );
  return 0;
}