#include <bits/stdc++.h>
#define ull unsigned ll
#define ll long long
#define ld long double
#define INFL (ll)3e18
#define INF (int)2e9
#define MOD (ll)998244353
#define MODO (ll)(1e9+7)
using namespace std;

template<typename T>istream&operator>>(istream&is,vector<T>&v);
template<typename... Ts>istream&operator>>(istream&is,tuple<Ts...>& t);
template<typename T1,typename T2>istream&operator>>(istream&is,pair<T1,T2>&p){is>>p.first>>p.second;return is;}
template<typename T>istream&operator>>(istream&is,vector<T>&v){for(T&in:v)is>>in;return is;}
template<typename... Ts>istream& operator>>(istream& is, tuple<Ts...>& t) {apply([&](auto&... args) {((is >> args), ...);},t);return is;}

int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n,m;
    cin >> n >> m;
    map<string,int> p;
    string s;
    int P;
    for(int i = 0;i < n;i++){
        cin >> s >> P;
        p[s] = P;
    }
    string t;
    ll ans = 0;
    for(int i = 0;i < m;i++){
        cin >> t;
        ans += p[t];
    }
    cout << ans << endl;
}