#include<bits/stdc++.h>
using namespace std;

int main(){
    int p1,p2,N, num, ans=0;
    vector<int> r;

    cin >> p1;
    cin >> p2;
    cin >> N;
    while(cin >> num) r.push_back(num);
    sort(r.begin(),r.end());

    int pre=0;
    for(int i=0;i<N;i++){
        if(pre==r[i]) ans+=p1+p2;
        else pre=r[i];
    }

    cout << ans << endl;

    return 0;
}