#include <iostream>
using namespace std;

int main() {
	int p1, p2, n, r[1000];
	int p;
	cin >> p1 >> p2 >> n;
	p = p1 + p2;
	int count = 0;
	for (int i = 0; i != n; i++) {
		cin >> r[i];
		for (int j = 0; j != i; j++) {
			if (r[i] == r[j]){
				count += 1;
				break;
			}
		}
	}
	cout << count * p << '\n';

	return 0;
}