#include "bits/stdc++.h"

using namespace std;

signed main() {

	int p1, p2, p, n;
	cin >> p1 >> p2;
	p = p1 + p2;
	int a[999] = { 0 };
	//cout << a << endl;
	int ans = 0;
	cin >> n;
	for (int i = 0; i < n; i++) {
		int rec = 0;
		cin >> rec;
		if (a[rec] == 0) {
			a[rec]++;
		}
		else {
			ans += p;
		}
	}
	cout << ans << endl;
}