from collections import Counter,defaultdict,deque
from heapq import heappop,heappush,heapify
from bisect import bisect_left,bisect_right 
import sys,math,itertools,pprint,fractions
sys.setrecursionlimit(10**8)
mod = 998244353
INF = float('inf')
def inp(): return int(sys.stdin.readline())
def inpl(): return list(map(int, sys.stdin.readline().split()))
def inpl_1(): return list(map(lambda x:int(x)-1, sys.stdin.readline().split()))
def inplm(): return map(int, sys.stdin.readline().split())
def inpl_1m(): return map(lambda x:int(x)-1, sys.stdin.readline().split())
def err(x): print(x); exit()

n,m = inpl()
a = inpl()
if m == 1:
    err(0)
d = defaultdict(int)
for x in a:
    d[x%m] += 1
res = n
seen = set()
for key in list(d):
    if key in seen:
        continue
    if key == 0:
        res -= d[key]-1
    else:
        seen.add(key)
        seen.add(m-key)
        res -= min(d[key], d[m-key])
print(res)