Baseball

from decimal import Decimal, ROUND_HALF_UP

def whip(a, b, c):
	return Decimal((a+b)/c).quantize(Decimal('.00'), ROUND_HALF_UP)

def ops(H, BB, HBP, AB, SF, TB):
	#obp = Decimal((H+BB+HBP)/(AB+BB+SF+HBP)).quantize(Decimal('.000'), ROUND_HALF_UP)
	#slg = Decimal(TB/AB).quantize(Decimal('.000'), ROUND_HALF_UP)
	return Decimal(((H+BB+HBP)/(AB+BB+SF+HBP))+(TB/AB)).quantize(Decimal('.000'), ROUND_HALF_UP)

for x in range(10):
	if x == 0:
		a, b, c = input().split(' ')
		a, b, c = int(a), int(b), int(c)
		print(whip(a, b, c))
	else:
		H, BB, HBP, AB, SF, TB = input().split(' ')
		H, BB, HBP, AB, SF, TB = int(H), int(BB), int(HBP), int(AB), int(SF), int(TB)
		print(ops(H, BB, HBP, AB, SF, TB))