#include <iostream>
#include <set>
using namespace std;
int main(void){
    int P1, P2, N;
    cin >> P1 >> P2 >> N;
    int oneLoss = P1 + P2;
    int ans = 0;
    set<int> R;
    int inr;
    for(int i=0; i<N; i++){
        cin >> inr;
        auto r = R.insert(inr);
        if(!r.second) ans+=oneLoss;
    }
    cout << ans << endl;
    return 0;
}