n, X = [int(x) for x in input().split(' ')]
numbers = [int(x) for x in input().split(' ')]
numbers_count = {}
count = 0

for num in numbers:
    if num in numbers_count:
        numbers_count[num] += 1

    else:
        numbers_count[num] = 1

for i in numbers_count:
    if (X - i) in numbers_count:
        count += numbers_count[i] * numbers_count[X - i]

print(count)