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

int main()
{
	int P1, P2, N;
	cin >> P1 >> P2 >> N;
	vector<int> R( 999 );
	long long ans = 0;
	for( int i = 0; i < N; i++ ) {
		int r;
		cin >> r;
		r--;
		if( R[r] ) ans += P1 + P2;
		else R[r] = 1;
	}

	cout << ans << endl;
}