import math
import copy

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

sumlist = []

for i in range(n):
    sumlist.append([ number_list[i] + number_list[j] for j in range(n) ].count(x))

print(sum(sumlist))