#include <iostream>

using namespace std;

int main() {
	int rooms[1000] = {0};
	int p1, p2;
	int n;
	cin >> p1 >> p2 >> n;
	for (size_t i = 0; i < n; ++i) {
		int r;
		cin >> r;
		++rooms[r];
	}
	int result = 0;
	for (size_t i = 0; i < 1000; ++i) {
		if (rooms[i] > 1) {
			result += (rooms[i] - 1) * (p1 + p2);
		}
	}
	cout << result << endl;
	return 0;
}