from collections import Counter


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

    modulo_counter = Counter(modulo_list)

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

    for num in range(1, (M+1)//2):
        if modulo_counter[num] > modulo_counter[M-num]:
            modulo_counter[M-num] = 0
        else:
            modulo_counter[num] = 0

    print(sum(modulo_counter.values()))


if __name__ == "__main__":
    main()