#include <iostream>
#include <algorithm>

typedef long long ll;

ll a[100002];
int main(){
        ll N,X;
        scanf("%lld",&N);
        scanf("%lld",&X);
        for(int i = 0; i < N; i++) scanf("%lld",a+i+1);

        std::sort(a+1,a+N+1);
        a[0] = a[N+1] = X+1;
        int left = 1, right = N+1;
        int cnt = 0;

        while(1){
                while(a[left]+a[right]>X){
                        right--;
                        if(left >= right) break;
                }
                if(a[left]+a[right] == X){
                        if(left==right) cnt += 1;
                        else            cnt += 2;
                        right--;
                }else{
                        left++;
                }
                if(left > right) break;
        }
        printf("%d\n",cnt);
}