import java.util.*;

public class Main{
	
	public static void main(String[] args)
	{
	    Scanner sc = new Scanner(System.in);

	    String nx = sc.nextLine();
	    String nums = sc.nextLine();

	    String[] nxArr = nx.split(" ");
	    String[] numsArr = nums.split(" ");

        int inputCount = Integer.parseInt(nxArr[0]);
	    int sum = Integer.parseInt(nxArr[1]);

	    int[] numArr = new int[inputCount];

	    for (int i=0;i<inputCount;i++){
	        numArr[i] = Integer.parseInt(numsArr[i]);
	    }

        int count = 0;
	    for (int i=0;i<inputCount;i++){
	        for(int j=0;j<inputCount;j++){
	            if (sum == numArr[i] + numArr[j])
	                count++;
	        }
	    }

	    System.out.println(count);
	}
}