#include <stdio.h>

int main (void){
	int a,b,c,n;
	int r[100];
	int e[1000]={0};
	scanf("%d %d %d",&a,&b,&n);
	for(int i = 0;i < n;i++) scanf("%d",&r[i]);

	for(int i = 0;i < n;i++){
		if(e[r[i]] == 0) e[r[i]] = 1;
		else c += a+b;
	}
	printf("%d\n",c);
	return(0);
}