package Main;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		int count =0;
		int s=0;
		int[] al=new int[100000];
 		Scanner kb=new Scanner(System.in);
		int n=kb.nextInt();
		int x=kb.nextInt();
		while(kb.hasNextInt())al[s]=(kb.nextInt());s++;
		
		for(int i=0;i<n;i++)
			for(int j=0;j<n;j++)
				if(al[i]+al[j]==x)
					count++;
		System.out.println(count);		
	}

}