#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <iomanip>
#include <cmath>
using namespace std;
#define diff(x,y) ((x > y) ? (x - y) : (y - x))

int main() {
	int p1, p2, n;
	int x;
	vector <int> r(1000, 0);
	int ans = 0;
	cin >> p1 >> p2 >> n;
	for (int i = 0; i < n; i++) {
		cin >> x;
		r[x]++;
		if (r[x] > 1)	ans += p1 + p2;
	}
	cout << ans << endl;
	return 0;
}