#include <iostream>
#include <vector>
#include <algorithm>
#include <map>

using namespace std;

int main()
{
  int n, m;
  cin >> n >> m;
  map<string, int> mp;
  long long ans = 0;
  for (int i = 0; i < n; ++i)
  {
    string s;
    int p;
    cin >> s >> p;
    mp[s] = p;
  }
  for (int i = 0; i < m; ++i)
  {
    string t;
    cin >> t;
    ans += mp[t];
  }
  cout << ans << endl;
}