题解 | #记负均正#

while True:
    try:
        n = int(input())
        numbers = list(map(int, input().split()))

        zhenshu = 0
        zhenshu_count = 0
        fushu_count = 0
        for i in numbers:
            if i < 0:
                fushu_count += 1
            elif i > 0:
                zhenshu += i
                zhenshu_count += 1
        if zhenshu_count == 0:
            print(fushu_count, '0.0')
        else:
            ave = zhenshu/zhenshu_count
            print(fushu_count, '%.1f'%ave)
    except:
        break