from collections import Counter, defaultdict


def main():
    N, M = map(int, input().split())
    modulo_list = map(lambda num: int(num) % M, input().split())

    modulo_counter = Counter(modulo_list)
    keys = list(modulo_counter.keys())
    keys.sort()

    modulo_counter_default_dict = defaultdict(int)
    modulo_counter_default_dict.update(modulo_counter)

    if modulo_counter_default_dict[0] > 0:
        modulo_counter[0] = 1
    if M % 2 == 0 and modulo_counter_default_dict[M // 2] > 0:
        modulo_counter[M//2] = 1

    for num_key in keys:
        if num_key == 0:
            continue

        if num_key >= (M+1) // 2:
            break

        if modulo_counter_default_dict[num_key] > modulo_counter_default_dict[M-num_key]:
            modulo_counter[M-num_key] = 0
        else:
            modulo_counter[num_key] = 0

    print(sum(modulo_counter.values()))


if __name__ == "__main__":
    main()