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

dict = {}

for i,v in enumerate(A):
    tmp =v%M
    if tmp not in dict:
        dict[tmp] = 1
    else:
        dict[tmp]+=1

tmp = []

for i,v in dict.items():
    tmp.append([v,i])

tmp.sort()
tmp.reverse()

ans = 0

for i,v in enumerate(tmp):
    a,b = v[0],v[1]

    if b*2 == M:
        ans+=1
    elif b == 0:
        ans+=1
    else:
        ans+=dict[b]
        if (M-b) in dict:
            dict[M-b] = 0

print(ans)