n,m = map(int,input().split())
dic = {}
A = list(map(int,input().split()))
for a in A:
    dic[a%m] = dic.get(a%m,0) + 1
    
ans = 0
done = set()
for key,value in dic.items():
    if key in done:
        continue
    if key == 0:
        ans += 1
        continue
    if m-key in dic:
        if m-key == key:
            ans += 1
        else:
            val2 = dic[m-key]
            ans += max(value,val2)
            done.add(m-key)
    else:
        ans += value
print(ans)