n, x = [int(s) for s in input().split(' ')]
nums = sorted([int(s) for s in input().split(' ')])
count = 0
for indexs, i in enumerate(nums):
    for s in nums[indexs:]:
        if (i + s) == x:
            count += 1
        elif (i + s) > x:
            break

print(count)