t = 1
#t = int(input())
for _ in range(t):
  n,m = map(int, input().split())
  dic = {}
  ans = 0
  for i in range(n):
    s,p = input().split()
    p = int(p)
    dic[s] = p
  for i in range(m):
    t = input()
    ans += dic[t]
  print(ans)