N,X =map(int,input().split())
l =[int(i) for i in input().split()]
d ={i:0 for i in range(10**5+1)}
n = 0
for i in l:
    d[i] += 1
if X > max(l)*2:
    n = 0
elif X > 10**5:
    for i in range(X-10**5,10**5+1):
        n += d[i] * d[X-i]
else:
    for i in range(X):
        n += d[i] * d[X-i]
print(n)