Problem:
Score : 200 points

Problem Statement

You have written N problems to hold programming contests.
The i-th problem will have a score of P_i points if used in a contest.

With these problems, you would like to hold as many contests as possible under the following condition:

A contest has three problems. The first problem has a score not greater than A points, the second has a score between A + 1 and B points (inclusive), and the third has a score not less than B + 1 points.

The same problem should not be used in multiple contests.
At most how many contests can be held?

Constraints

3 \leq N \leq 100

1 \leq P_i \leq 20 (1 \leq i \leq N)

1 \leq A < B < 20

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A B
P_1 P_2 ... P_N

Output

Print the answer.

Sample Input 1

7
5 15
1 10 16 2 7 20 12

Sample Output 1

2

Two contests can be held by putting the first, second, third problems and the fourth, fifth, sixth problems together.

Sample Input 2

8
3 8
5 5 5 10 10 10 15 20

Sample Output 2

0

No contest can be held, because there is no problem with a score of A = 3 or less.

Sample Input 3

3
5 6
5 6 10

Sample Output 3

1

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

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

class Program
{
  static void Main()
  {
    int N = int.Parse(Console.ReadLine());
    string[] points = Console.ReadLine().Split(' ');
    int A = int.Parse(points[0]);
    int B = int.Parse(points[1]);
    
    List<int> score = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).OrderBy(x => x).ToList();
    int count = 0;
    for (int i = 0; i < N; i ++)
    {
      for (int j = 1; j < N; j ++)
      {
        for (int k = 2; k < N; k ++)
        {
          if (score[i] <= A && score[j] > A && score[j] <= B && score[k] > B)
          {
            count ++;
            score.Remove(score[i]);
            score.Remove(score[j]);
            score.Remove(score[k]);
            if (count == N / 3) goto Complete;
          }
        }
      }
    }
    Complete: ;
  }
}