def get_data(data_left, nokori):
    # print(data_left, nokori)
    while 1:
        if len(data_left) == 0:
            break
        if data_left[-1] <= 0:
            data_left.pop(-1)
            nokori += 1
        else:
            break

    # print(data_left, nokori)

    while nokori > 0:
        if len(data_left) == 0:
            break
        min_data = min(data_left)
        if min_data < 0:
            data_left.pop(data_left.index(min_data))
            nokori -= 1
        else:
            break
        # print('uuu', data_left)

    # print(data_left)

    while 1:
        if len(data_left) == 0:
            break
        saigo = data_left[-1]
        min_data = min(data_left)

        if saigo + min_data < 0:
            data_left.pop(-1)

            if len(data_left) == 0:
                nokori += 1
                break
            if min_data not in data_left:
                nokori += 1
            else:
                # print(data_left.index(min_data))
                data_left.pop(data_left.index(min_data))
        else:
            break

    return nokori, data_left

def main():

    num_houseki, num_sousa = map(int, input().split())
    data = list(map(int, input().split()))


    ans = 0


    # dp = defaultdict(int)

    for i in range(num_sousa + 1):

        nokori = 0
        left_ind = min(i, num_houseki)
        nokori += i - left_ind
        righ_ind = max(left_ind, num_houseki - num_sousa + i)
        nokori += num_sousa - i - num_houseki + righ_ind
        data_left = data[:left_ind]
        data_right = data[righ_ind:]

        # print('<><<><<><')
        # print(data_left)
        # print(data_right)

        pre_left = data_left.copy()
        pre_right = data_right.copy()

        nokori, data_left = get_data(data_left, nokori)
        nokori, data_right = get_data(data_right[::-1], nokori)
        data_right = data_right[::-1]

        nokori, data_left = get_data(data_left, nokori)
        nokori, data_right = get_data(data_right[::-1], nokori)
        data_right = data_right[::-1]

        nokori, data_left = get_data(data_left, nokori)
        nokori, data_right = get_data(data_right[::-1], nokori)
        data_right = data_right[::-1]

        nokori, data_left = get_data(data_left, nokori)
        nokori, data_right = get_data(data_right[::-1], nokori)
        data_right = data_right[::-1]



        # print('----')
        # print(data_left)
        # print(data_right)

        kari = sum(data_right) + sum(data_left)
        if kari > ans:
            ans = kari

    print(ans)







if __name__ == '__main__':
    main()


### FIXED CODE ###




def main():

    num_houseki, num_sousa = map(int, input().split())
    data = list(map(int, input().split()))

    ans = 0

    for left in range(min(num_houseki, num_sousa) + 1):
        for righ in range(min(num_sousa- left, num_houseki - left) + 1):
            data_left = data[:left]
            data_righ = data[num_houseki - righ:]
            data_now = data_left + data_righ
            data_now.sort()
            nokori = num_sousa - len(data_now)

            while nokori > 0:
                if len(data_now) == 0:
                    break
                if data_now[0] < 0:
                    data_now.pop(0)
                    nokori -= 1
                else:
                    break

            kari = sum(data_now)
            if kari > ans:
                ans = kari

    print(ans)





if __name__ == '__main__':
    main()