from collections import Counter
X = input() # number of shoes
shoeSizes = Counter(list(map(int, input().split())))
N = int(input())
total = 0
for _ in range(N):
    customer = list(map(int, input().split()))
    try:
        shoseSize = shoeSizes[customer[0]]
        if shoeSizes[customer[0]] > 0:
            total += customer[1]
            shoeSizes[customer[0]] -= 1
    except:
        pass

print(total)