import bisect
N,X=map(int,input().split())

a=list(map(int,input().split()))

c=set(a)
b=list(c)
b.sort()
#print(b)

L=[0 for i in range(len(b))]

for i in range(N):
    L[bisect.bisect_left(b,a[i])]+=1
#print(L)
ans=0
ans2=0
for i in range(len(b)):
    if b[i]*2==X:
        ans2+=L[bisect.bisect_left(b,b[i])]**2
    else:
        if (X-b[i]) in c:
            ans+=b[i]*L[bisect.bisect_left(b,X-b[i])]
print(ans//2+ans2)
#print(ans,ans2)