#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

int main()
{
    int p, pp, n, r[1000] = {}; cin >> p >> pp >> n;

    for (int i = 0; i < n; i++) {
        int t; cin >> t;
        r[t]++;
    }

    int cnt = 0;
    for (auto x : r) if (x > 1) cnt += x - 1;

    cout << cnt * (p + pp) << endl;

    return 0;
}