mod = 998244353


def main():
    import sys
    input = sys.stdin.readline

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

    cnt = {}
    for a in A:
        d = a % M
        if d not in cnt:
            cnt[d] = 0
        cnt[d] += 1
    seen = set()
    ans = 0
    for d in cnt:
        if d in seen:
            continue
        seen.add(d)
        if d == 0:
            seen.add(0)
            ans += 1
        elif d * 2 == M:
            seen.add(d)
            ans += 1
        else:
            dd = M - d
            if dd not in cnt:
                ans += cnt[d]
            else:
                ans += max(cnt[d], cnt[dd])
                seen.add(dd)
    print(ans)


if __name__ == '__main__':
    main()