#include<stdio.h>

int main(void){
	
	int i, n;
	int p1, p2;
	int rn, r[1000];
	int c = 0;
	
	scanf("%d%d%d", &p1, &p2, &n);

	for(i = 1;i < 1000;i++){
		r[i] = 0;
	}
	for(i = 0;i < n;i++){
		scanf("%d", &rn);
		r[rn]++;
	}
	for(i = 1;i < 1000;i++){
		if(r[i] > 1){
			c += (p1 + p2) * (r[i] - 1);		
		}
	}
	
	printf("%d\n", c);

	
	return 0;
}