from collections import defaultdict


def get_list(ty=int):
    return list(map(ty, input().split()))


def get_int():
    return int(input())


def get_str():
    return input()


N, M = get_list()
A = get_list()

if M == 1:
    print(1)
    exit()

cnt = defaultdict(int)
for a in set(A):
    cnt[a % M] += 1

ans = 0
if cnt[0] > 0:
    ans += 1

keys = cnt.keys()
used = {0}
for k in list(keys):
    if not k in used:
        used.add(k)
        k2 = M-k
        used.add(k2)
        ans += max(cnt[k], cnt[k2])

print(ans)