题解 | #中彩票的的概率#

prize = list(map(str, input().split()))
chance = list(map(float, input().split()))
dic = {}
admmin = list(map(str, input().split()))
all = []
num = 1

for i in range(len(prize)):
    dic[prize[i]] = chance[i]

for i in range(len(admmin)):
    if admmin[i] in dic:
        all.append(dic[admmin[i]])
if len(all) == 1:
    for i in range(len(all)):
        print(all[i])
else:
    for i in all:
        num *= i
print("{:.3f}".format(num))