n, x = [ int(v) for v in input().split() ]
number_list = [ int(v) for v in input().split() ]

setlist = list(set(number_list))
countlist = [ number_list.count(i) for i in setlist]


s = 0
for i in setlist:
    if x - i in setlist:
        t = (number_list.count(i)*number_list.count(x-i))
        if x - i == i:
            s += t
        else:
            s += 2*t
    if i >= x//2:
        break
print(s)