#include <iostream>
using namespace std;

int room[1000] = {0};
int bookking = 0;
int yuki, other;
int main(){
    cin >> yuki >> other;
    int n; cin >> n;
    int res;
    for(int i = 0; i < n; i++){
        cin >> res;
        if(room[res] == 1) bookking += 1;
        room[res] = 1;
    }
    cout << bookking * (yuki + other) << endl;

    return 0;
}