#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define precise(i) fixed << setprecision(i)
using namespace std;
using RoomNumber = int;
using Book = int;

void solve() {
  int p1, p2;
  cin >> p1 >> p2;

  int n;
  cin >> n;

  map<RoomNumber, Book> mp;

  for (int i = 0; i < n; i++) {
    int room;
    cin >> room;

    if (mp.find(room) != mp.end()) {
      mp[room] += 1;
    } else {
      mp[room] = 1;
    }
  }

  int cnt = 0;
  for (const auto r : mp) {
    if (r.second > 1)
      cnt += r.second - 1;
  }

  cout << (p1 + p2) * cnt << '\n';
}

void wrapper() {
  int loop;
  cin >> loop;
  rep(i, loop) {
    cout << "[TEST " << i + 1 << "]\n";
    solve();
    cout << "\n";
  }
}

int main() {
  fastIO;
#ifdef _DEBUG
  wrapper();
#else
  solve();
#endif
}