#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> vi;

const int dx[4] ={1,0,-1,0};
const int dy[4] ={0,1,0,-1};

#define Endl endl
#define INF 99999999
#define all(v) v.begin(),v.end()
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i= 0;i<n;i++)

int main(){

	int p1,p2,n,r;
	ll ans = 0;
	bool j[100];

	cin >> p1 >>p2;
	cin >> n;

	rep(i,n){
		cin >>r;
		if(j[r] == false){
			j[r] = true;
		}
		else{
			ans += p1+p2;
		}
	}

	cout << ans <<Endl;

	return 0;

}