#include <stdio.h>
#include <algorithm>
using namespace std;

int main() {
	int price[2], n, r[999];
	scanf("%d %d %d", price, price + 1, &n);
	for (int i = 0; i < n; i++)
		scanf("%d", r + i);
	sort(r, r + n);

	int cost = 0;
	for (int i = 1; i < n; i++)
		if (r[i] == r[i - 1])
			cost += price[0] + price[1];
	printf("%d\n", cost);
}