#include <bits/stdc++.h>
using namespace std;
int main(void){
    int n,m;
    cin>>n>>m;
    map<string,long long>mp;
    while(n--){
        string s;
        int p;
        cin>>s>>p;
        mp[s]=p;
    }
    long long ans=0;
    while(m--){
        string s;
        cin>>s;
        ans+=mp[s];
    }
    cout<<ans<<endl;
    return 0;
}