import sys
import pypyjit
import itertools
import heapq
import math
from collections import deque, defaultdict
import bisect

input = sys.stdin.readline
sys.setrecursionlimit(10 ** 6)
pypyjit.set_param('max_unroll_recursion=-1')


def index_lt(a, x):
    'return largest index s.t. A[i] < x or -1 if it does not exist'
    return bisect.bisect_left(a, x) - 1


def index_le(a, x):
    'return largest index s.t. A[i] <= x or -1 if it does not exist'
    return bisect.bisect_right(a, x) - 1


def index_gt(a, x):
    'return smallest index s.t. A[i] > x or len(a) if it does not exist'
    return bisect.bisect_right(a, x)


def index_ge(a, x):
    'return smallest index s.t. A[i] >= x or len(a) if it does not exist'
    return bisect.bisect_left(a, x)


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

D = defaultdict(int)
checked = set()
zero = 0
for a in A:
    p = a % M
    if p == 0:
        zero = 1
        continue
    D[a % M] += 1
    D[M - a % M] += 0
ans = 0
for k in D.keys():
    if k in checked:
        continue
    checked.add(k)
    checked.add(M - k)
    if k == M - k:
        ans += 1
    else:
        ans += max(D[k], D[M - k])
print(ans + zero)