no_of_shoes = int(input())
shoes = input()
shoe_list = list(map(int, shoes.split(" ")))
no_of_cus = int(input())
profit = 0
for i in range(no_of_cus):
    choice = input()
    choice_list = list(map(int, choice.split(" ")))
    if choice_list[0] in shoe_list:
        profit += choice_list[1]
        shoe_list.remove(choice_list[0])
        
print(profit)