n, x = map(int, input().split())
a_list = list(map(int, input().split()))

number_count = {}
for a in a_list:
    if a in number_count:
        number_count[a] = number_count[a] + 1
    else:
        number_count[a] = 1

count = 0
for a in a_list:
    j = x - a
    if j not in number_count:
        continue
    count = count + number_count[j]

print(count)