#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>
#include <stack>
#include <cmath>
#include <queue>
#include <numeric>


int main()
{
	long long p1, p2;
	long long n;

	std::map<long long, long long> r;

	std::cin >> p1 >> p2 >> n;

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

		r[room]++;
	}

	long long count = 0;

	for (auto i = r.begin(); i != r.end(); i++)
	{
		count += i->second - 1;
	}

	std::cout << count * (p1 + p2) << std::endl;

	return 0;
}