SDA - 2019 2020 - test5 - task 1

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;

unordered_map<string, int> taxes;

int main() {
    int n, m;
    cin >> n >> m;
    string town;
    int tax;

    for(int i = 0; i < n; i++){
        cin >> town >> tax;
        taxes[town] = tax;
    }
    long long sum = 0;
    for(int i = 0; i < m; i++){
        cin >> town;
        sum += taxes[town];
    }
    cout << sum;
    return 0;
}