import java.util.*;

public class Main{
  static StringBuilder sb = new StringBuilder("");
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int P1 = sc.nextInt();
    int P2 = sc.nextInt();
    int nin = sc.nextInt();
    int[] heya = new int[nin];
    for (int i=0;i<nin ;i++ ) {
      heya[i] = sc.nextInt();
    }
    sc.close();
    Arrays.sort(heya);

    int temp = heya[0];
    int cnt = 0;
    for (int i=1;i<nin ;i++ ) {
      if (temp==heya[i]) {
          cnt++;
      }else{
        temp=heya[i];
      }
    }
    int result = (P1+P2)*cnt;
    System.out.println(result);
  }
}