from fractions import gcd
from datetime import date
from math import factorial
import functools
from heapq import*
from collections import deque
import collections
import math
from collections import defaultdict, Counter
import sys
sys.setrecursionlimit(10 ** 7)
MOD = 10 ** 9 + 7
inf = float("inf")


def main():
    n, x = map(int, input().split())
    a = list(map(int, input().split()))
    d = Counter(a)
    ans = 0
    for i in range(n):
        if d[x - a[i]] > 0:
            ans += d[x - a[i]]
    print(ans)


if __name__ == '__main__':
    main()