import cmath
import sys
from collections import deque, defaultdict
from heapq import heappop,heappush
from copy import deepcopy

INF=10**18
MOD=10**9+7
MAX=10**5+7

def main():
  N,X=map(int, input().split())
  A=list(map(int, input().split()))

  mp=defaultdict(int)
  for a in A:
    mp[a]+=1

  ans=0
  for a in A:
    ans+=mp[X-a]

  print(ans)


if __name__=='__main__':
    main()