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

int main() {
  int p1, p2;
  cin >> p1 >> p2;
  int N;
  cin >> N;
  int flag[1001];
  int ans = 0;
  for (int i = 0; i < N; i++) {
    int a;
    cin >> a;
    if (flag[a] >= 1) {
      ans += p1 + p2;
    }
    flag[a]++;
  }
  cout << ans << endl;

  return 0;
}