n,x = map(int,input().split())
num = list(map(int,input().split()))
a = {}
k = 0
for i in num :
    if i in a :
        a[i] += 1
    else :
        a[i] = 1

for j in a :
    if x - j in a :
        k += a[j]*a[x-j]

print(k)