N,X=map(int,input().split())
A=list(map(int,input().split()))

from collections import Counter
C=Counter(A)

ANS=0
for i in range(10**5+1):
    k=X-i

    if k==i:
        ANS+=C[i]*C[i]
    else:
        ANS+=C[i]*C[k]

print(ANS)