#include <bits/stdc++.h>
using namespace std;
int main() {
	int P1, P2, P, N, tmp;
	cin >> P1 >> P2;
	P = P1 + P2;
	cin >> N;
	map<int, int> R;
	for(int i = 0; i < N; i++) {
		cin >> tmp;
		if(R.find(tmp) == R.end()) R[tmp] = 0;
		R[tmp]++;
	}
	int C = 0;
	for(auto it = R.begin(); it != R.end(); it++) {
		C += (it->second - 1) * P;
	}
	cout << C << endl;
	return 0;
}