题解 | 中彩票的的概率
a=list(map(int,input().split()))
b=list(map(float,input().split()))
c=list(map(int,input().split()))
dict={}
n=1
for i in range(len(a)):
dict[a[i]]=b[i]
for m in c:
if m in dict:
n*=dict[m]
else :
continue
print(round(n,3))
