#include <iostream>
int main() {
	int P,FP,N;
	std::cin >> P >> FP >> N;
	int* R = new int[N];

	for (int i = 0; i < N; i++) {
		std::cin >> R[i];
	}

	int LostMoney = 0;

	if (N >= 2) {
		for (int i = 1; i < N; i++) {
			for (int j = 0; j < i; j++) {
				if (R[i] == R[j]) {
					LostMoney += P + FP;
				}
			}
		}
	}

	std::cout << LostMoney << std::endl;

	return 0;
}