import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
from collections import Counter

n,p = na()

a = na()

x = p
ans = 0
while x <= 10**9:
    b = Counter([a[i] % x for i in range(n)])
    for i in b:
        ans += b[i] * (b[i]-1)//2
    x *= p
print(ans)