#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,M; cin >> N >> M;
    map<string,int> SP;
    while(N--){
        string s; int v; cin >> s >> v;
        SP[s] = v;
    }
    long long answer = 0;
    while(M--){
        string s; cin >> s;
        answer += SP[s];
    }
    cout << answer << endl;
}