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

cnt = {}

for a in A:
    base1 = a * 10 + 1
    base2 = a * 10 + 2

    t1 = (a + D) * 10 + 1
    t2 = (a + D) * 10 + 2
    t3 = (a + D) * 10 + 3

    cnt[t1] = cnt.get(t1, 0) + 1

    # A*10+1 がある場合
    if base1 in cnt:
        cnt[t2] = cnt.get(t2, 0) + cnt[base1]

    # A*10+2 がある場合
    if base2 in cnt:
        cnt[t3] = cnt.get(t3, 0) + cnt[base2]

# 下一桁が3の値を合計
ans = 0
for k in cnt:
    if k % 10 == 3:
        ans += cnt[k]

print(ans)