import sys
input=lambda: sys.stdin.readline().rstrip()
n,x=map(int,input().split())
A=[int(i) for i in input().split()]
import collections
D=collections.defaultdict(int)
ans=0
for a in A:
  ans+=2*D[x-a]
  D[a]+=1
  if a*2==x:
    ans+=1
print(ans)