题解 | #记负均正#

def func(lst):
    while True:
        if 0 in lst:
            lst.remove(0)  # 删除列表的某个值，只能删掉第一个
        else:
            break
    # print(lst)
    lst_m = []
    lst_p = []
    for i in lst:
        if i < 0:
            lst_m.append(i)

        else:
            lst_p.append(i)
    num = round(sum(lst_p) / len(lst_p), 1)
    print(len(lst_m), num)


k = int(input())
lst = list(map(int, input().split()))
if sum(lst) == 0:
    print(0, 0.0)
else:
    func(lst)