num = int(input())
weight_list = []
wight = input().split(' ')
count = input().split(' ')
for i in range(num):
    for j in range(int(count[i])):
        weight_list.append(int(wight[i]))
total_weight = {0}
for i in weight_list:
    for j in list(total_weight):
        total_weight.add(i+j)
print(len(total_weight))