ans=0
cnt={}
N,X=map(int,input().split())
a=list(map(int,input().split()))

for i in a:
    if i in cnt:
        cnt[i]+=1
    else:
        cnt[i]=1

for i in cnt:
    if (X-i) in cnt:
        ans+=cnt[i]*cnt[X-i]

print(ans)