import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int m = sc.nextInt();
        int add = sc.nextInt();
        Map<Integer, List<Integer>> points = new HashMap<>();
        for (int i = 0; i < n; i++) {
            int quority = sc.nextInt();
            int type = sc.nextInt();
            if (!points.containsKey(type)) {
                points.put(type, new ArrayList<>());
            }
            points.get(type).add(quority);
        }
        List<Integer> values = new ArrayList<>();
        for (List<Integer> each : points.values()) {
            Collections.sort(each);
            for (int i = 0; i < each.size() - 1; i++) {
                values.add(each.get(i));
            }
            values.add(each.get(each.size() - 1) + add);
        }
        long[] sums = new long[n + 1];
        Collections.sort(values, (a, b) -> b - a);
        for (int i = 0; i < n; i++) {
            sums[i + 1] = sums[i] + values.get(i);
        }
        int k = sc.nextInt();
        System.out.println(IntStream.range(0, k).mapToLong(i -> sums[sc.nextInt()]).sum());
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}