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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<pair<string, int>> a(n);
    for(auto &&[s, v] : a) cin >> s >> v;
    sort(a.begin(), a.end());
    string t;
    ll ans = 0;
    while(m--){
        cin >> t;
        int p = lower_bound(a.begin(), a.end(), make_pair(t, -1)) - a.begin();
        ans += a[p].second;
    }
    cout << ans << '\n';
}