#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;

int A[1000];

int main()
{
	int P1, P2; cin >> P1 >> P2;
	int N; cin >> N;
	
	for (int i = 0; i < N; i++) {
		int r; cin >> r;
		A[r]++;
	}

	int ans = 0;
	for (int i = 0; i < 1000; i++) {
		if(A[i])ans += (A[i] - 1)*(P1 + P2);
	}
	cout << ans << endl;

    return 0;
}