题解 | #记负均正#

while True:
    try:
        num = int(input())
        li = list(map(lambda x:int(x), input().split()))
    except EOFError:
        break
    print(len(list(filter(lambda x:x<0, li))), end=" ")
    postives = list(filter(lambda x:x>0, li))
    print(round(sum(postives)/len(postives),1) if postives else 0.0)