shoki = input();
shokid = shoki.split(" ");
hai = int(shokid[0]);
wa = int(shokid[1]);

retu = input();
retud = retu.split(" ");
data = 0;
count = 0;

for first in range(0,hai):
	for second in range(0,hai):
		data = int(retud[first]) + int(retud[second]);
		if data == wa:
			count = count+ 1;

print(count);