题解 | #记负均正#

while True:
    try:
        n = int(input())
        pos = []
        neg = [] 
        s = input().split(' ')
        for item in s:
            if int(item) > 0:
                pos.append(int(item))
            elif int(item) < 0: 
                neg.append(int(item))
        if pos == []:
            print(len(neg), 0.0)
        else:
            print(len(neg), round(sum(pos)/len(pos),1))
    except:
        break