#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000
#define int long long 

signed main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int N, X;
	cin >> N >> X;
	int a[N];
	rep(i, N) cin >> a[i];
	int cnt[100010] = {};
	rep(i, N) cnt[a[i]]++;
	int ans = 0;
	rep(i, N) {
		if (X - a[i] <= 100000 && X - a[i] >= 0) ans += cnt[X - a[i]];
	}
	cout << ans << endl;


    return 0;
}