N,X=map(int,input().split())
a=list(map(int,input().split()))
cnt={}
ans=0
for i in range(N):
  if a[i] not in cnt:
    cnt[a[i]]=1
  else:
    cnt[a[i]]+=1
for i in cnt:
  if X-i in cnt:
    ans+=(cnt[i]*cnt[X-i])
print(ans)