N,X=map(int,input().split())
a=list(map(int,input().split()))
checked=[]
ans=0
for i in range(N):
  if a[i] in  checked:
    pass
  else:
    checked.append(a[i])
    b=X-a[i]
    ans+=(a.count(a[i])*(a.count(b)))
print(ans)