#include <bits/stdc++.h>

using namespace std;

int main(void) {
  int p, q, n;
  cin >> p >> q >> n;
  
  map<int, int> mp;
  for (int i = 0; i < n; i++) {
    int r;
    cin >> r;
    mp[r]++;
  }

  int ans = 0;
  for (auto i : mp) {
    ans += (i.second - 1) * (p + q);
  }
  cout << ans << endl;

  return 0;
}