#include<iostream>
#include<stdlib.h>
#include<vector>
#include<algorithm>
using namespace std;

int main()
{
    int p1, p2, N, money = 0;
    cin>>p1>>p2>>N;
    vector<int>room_number(N);
    for(int i=0;i<N;i++){
        cin>>room_number[i];
    }
    sort(room_number.begin(),room_number.end());
    for(int i=0; i<N-1; i++){
        if(room_number[i] == room_number[i+1]){
            money += (p1+p2);
        }
    }
    cout<<money<<endl;
    return EXIT_SUCCESS;
}