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 range(len(A2)):
    for j in range(i,len(A2)):
        sum = A[i] + A2[j]
        if sum == X and i == j:
            cnt += 1
        elif sum == X and i != j:
            cnt += 2
print(cnt)