#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> pip;
const ll INF = 1e9+100;
const ll MOD = 1e9+7;
const double EPS  = 1e-10;
const bool debug = 0;
//---------------------------//

int P1, P2;
int N;
bool done[1000];

int main() {
	cin >> P1 >> P2;
	cin >> N;
	
	ll ans = 0;
	REP(i, N) {
		int R;
		scanf("%d", &R);
		if (done[R]) {
			ans += P1 + P2;
		}
		done[R] = true;
	}
	
	cout << ans << endl;
	return 0;
}