import sys, time, random
from collections import deque, Counter, defaultdict
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

n, m = mi()

a = li()

if m % 2:
    print(0)
    exit()
C = Counter(a)
ans = 0
for i in range(n):
    ans += C[(a[i] - m // 2 - 1) % m + 1] * (n - 2)

print(ans // 2)