from collections import defaultdict

N, X = map(int, input().split())
As = list(map(int, input().split()))

dic = defaultdict()
dic.default_factory = lambda: 0

for a in As:
    dic[a] += 1

count = 0
for key in list(dic.keys()):
    count += dic[key] * dic[X - key]
    
print(count)