#include<iostream>
#include<vector>

using namespace std;
#define repeat(i,n) for(int i=0;i<(n);i++)

int main(){

   int N, X;
   cin>> N>> X;
   int a[N];
   repeat(i, N) cin>> a[i];

   vector<int> cnt(100005, 0);
   for(int e: a) cnt[e]++;
   long long ans=0;
   for(int e: a){
      if(X-e<0 or X-e>=cnt.size()) continue;
      ans+=cnt[X-e];
   }

   cout<< ans<< endl;

   return 0;
}