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

int main() {
	int p1, p2, n;
	cin >> p1 >> p2 >> n;
	int puni[1001]{};
	for (int i = 0; i < n; i++) {
		int r;
		cin >> r;
		puni[r]++;
	}
	int ans = 0;
	for (int i = 0; i < 1001; i++) {
		ans += max(0, (puni[i] - 1) * (p1 + p2));
	}
	cout << ans << endl;
	return 0;
}