#define _USE_MATH_DEFINES

#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max,count
#include <string>	//string,getline
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap, pair
#include <cstdlib>	//abs(int)
#include <cmath>	//sqrt,ceil,M_PI, pow, sin
#include <sstream>	//stringstream,getline
#include <numeric>	//gcd, accumlate
#include <deque>	//deque

using namespace std;

int main() {

	int a, b, n;
	cin >> a >> b >> n;

	vector<int> R(n);

	for (int i = 0; i < n; i++) {
		cin >> R[i];
	}

	sort(R.begin(), R.end());
	R.erase(std::unique(R.begin(), R.end()), R.end());

	int ans = (a + b) * (n - R.size());
	cout << ans << endl;

	return 0;

}