import java.util.*;

class Main {
    public static void main(String[] args) {
        // input
        Scanner in = new Scanner(System.in);
        int p1 = in.nextInt();
        int p2 = in.nextInt();
        int n = in.nextInt();
        int[] r = new int[n];
        for(int i=0; i<n; i++)
            r[i] = in.nextInt();

        // sort
        Arrays.sort(r);

        int count = 0;
        int i = 0;
        while(i<n) {
            int temp = r[i];
            int j;
            for(j=i+1; j<n; j++) {
                if(temp == r[j])
                    count++;
                else
                    break;
            }
            i = j;
        }

        System.out.println((p1+p2) * count);
    }
}