#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int n, m;
    cin >> n >> m;
    map<string, ll> mp;
    rep(i, n) {
        string s;
        ll p;
        cin >> s >> p;
        mp[s] = p;
    }
    ll ans = 0;
    rep(i, m) {
        string s;
        cin >> s;
        ans += mp[s];
    }
    cout << ans << endl;
    return 0;
}