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):
    if i <= x:
        for s in nums[indexs+1:]:
            if (i + s) == x:
                count += 2
            elif i * 2 == x:
                count += 1
            elif (i + s) > x:
                break
    else:
        break

print(count)