N, X = [int(k) for k in input().split()]
a = [int(k) for k in input().split()]

d = {}
for i in a:
    if not i in d:
        d[i] = 1
    else:
        d[i] += 1
c = 0
for i in d:
    if X - i in d:
        c += d[X - i] * d[i]
print(c)