题解 | #记负均正#

while True:
    try:
        n = int(input())
        xlist = list(map(int, input().split()))
        ncount = 0
        p = []
        for i in xlist:
            if i < 0:
                ncount += 1
            elif i > 0:
                p.append(i)
        if len(p) == 0:
            aver = 0
        else:
            aver = sum(p)/len(p)
        print(ncount,'%.1f' % aver)
    except:
        break