ans = 0

def slv(ls, P):
    global ans
    dic = dict()
    flag = 0
    for i in ls:
        if i % P not in dic:
            dic[i % P] = []
        dic[i % P].append(i // P)
        if i // P != 0:
            flag = 1
    if flag == 0:
        return
    for i in dic:
        ans += len(dic[i]) * (len(dic[i]) - 1) // 2
        slv(dic[i], P)

N, P = map(int, input().split())
A = list(map(int, input().split()))
slv(A, P)
print(ans)