#include <iostream>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <cmath>
#include <string>
#include<sstream>
#include <queue>
#include <limits>
#include <cstdlib>
#include <deque>
using namespace std;

int main() {

	int yukihotel_fee =0;
	int anotherhotel_fee =0;

	int n=0;

	int roomnumber[1000] ={};

	cin>>yukihotel_fee>>anotherhotel_fee>>n;

	int reservation =0;

	int overbook =0;

	for(int i=0; i<n; i++){
		cin>>reservation;

		if(roomnumber[reservation] ==0){
			roomnumber[reservation]++;
		}else {
			overbook++;
		}
	}

	cout<<(yukihotel_fee+anotherhotel_fee)*overbook<<endl;



	return 0;
}