from collections import defaultdict
import sys,heapq,bisect,math,itertools,string,queue,datetime
sys.setrecursionlimit(10**8)
INF = float('inf')
mod = 10**9+7
eps = 10**-7
AtoZ = [chr(i) for i in range(65,65+26)]
atoz = [chr(i) for i in range(97,97+26)]

def inpl(): return list(map(int, input().split()))
def inpl_str(): return list(input().split())

N,X = inpl()
aa = inpl()
aa.sort()
ans = 0
for a in aa:
	L = bisect.bisect_left(aa,X-a)
	R = bisect.bisect_right(aa,X-a)
	ans += R-L
print(ans)