题解 | #记负均正#

while True:
    try:
        int_num = int(input())
        num_list = input().split(" ")
        num_list_2 = num_list[:int_num]
        num_result_1 = 0
        num_result_2 = 0
        num_result = 0
        for i in num_list_2:
            if int(i) < 0:
                num_result_1 += 1
            elif int(i) > 0:
                num_result_2 += 1
                num_result += int(i)
        print("%d %.2f" % (num_result_1, num_result/num_result_2))
    except:
        break