from collections import defaultdict


n,x=map(int,input().split())
d=defaultdict(int)
a=list(map(int,input().split()))
ans=0
done=set()
for i in a:
    d[i]+=1
for i in a:
    if i in done:
        continue
    ans+=d[i]*d[x-i]
    done.add(i)
print(ans)