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

int main() {
  int P1, P2, N, R;
  cin >> P1 >> P2 >> N;
  vector<int> V(1000);
  while (cin >> R) V.at(R)++;
  int ans = 0;
  for (int i = 0; i < 1000; i++) if (V.at(i) > 1) ans += (V.at(i) - 1) * (P1 + P2);
  cout << ans << "\n"; 
}