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

cnt = 0
A2 = []
for i in range(N):
    if A[i] <= X:
        A2.append(A[i])

for i in A2:
    for j in A2:
        sum = i + j
        if sum == X:
            cnt += 1
print(cnt)