#include <bits/stdc++.h>

using namespace std;

int main() {
    int p1, p2, n;
    cin >> p1 >> p2 >> n;

    int cnt[1000] = {};
    for (int i = 0; i < n; ++i) {
        int r;
        cin >> r;
        cnt[r]++;
    }

    int ans = 0;
    for (int i = 0; i < 1000; ++i) {
        if (cnt[i] > 1) ans += (cnt[i] - 1) * (p1 + p2);
    }
    cout << ans << endl;
    return 0;
}