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

int main() {
	int P1, P2, N, R, count = 0;
	map<int, int> mp;
	cin >> P1 >> P2 >> N;
	for (int i = 0; i < N; i++) {
		cin >> R;
		if (mp[R] != 0) count++;
		mp[R]++;
	}
	cout << (P1 + P2) * count << endl;
}