#include <bits/stdc++.h>

using namespace std;

#define REP(i, n) for(int i = 0; i < n; i++)

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int p1, p2, n;
    cin >> p1 >> p2 >> n;
    int r, cnt[1000] = {};;
    REP(i, n) {
        cin >> r;
        cnt[r]++;
    }

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