#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main(){
	int i, j, k;
	int n, x;
	vector<bool>flag(100009, false);
	vector<int>list;
	int cnt2 = 0;

	cin >> n >> x;


	for (i = 0; i < n; i++) {
		int num;
		cin >> num;

		if ( (x - num > 100000) || (x - num < 0)) {

		}
		else {
			if (flag[x - num] == true) cnt2++;
			flag[x - num] = true;
		}

		list.push_back(num);

	}

	int cnt = 0;

	for (i = 0; i < n; i++) {
		if (flag[list[i]] == true) {
			cnt++;
		}
	}


	cout << cnt + cnt2 << endl;










	getchar();
	getchar();
	return 0;
}