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

int main(){
    int p1, p2, N;
    cin >> p1 >> p2 >> N;
    int c = 0;
    vector<int> freq(1000, 0);
    while (N--){
        int r;
        cin >> r;
        ++freq[r];
    }
    for (auto & r : freq){
        if (r > 1){
            c += (r - 1) * (p1 + p2);
        }
    }
    cout << c << endl;
    return 0;
}