N,X = list(map(int,input().split()))
a = list(map(int,input().split()))
C = 10 ** 5
dat = [0] * (C+1)
for i in a:
    dat[i] += 1
count = 0
for i in range(C+1):
    if 0 <= X - i <= C:
        count += dat[i] * dat[X-i]
print(count)