#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you
const int INF = 999999999;
const int MOD = 1e9 + 7;

int main() {
	int a, b, c, k[105];
	cin >> a >> b >> c;
	a += b;
	set<int>s;
	for (int i = 0; i < c; ++i) {
		cin >> k[i];
		s.insert(k[i]);
	}
	cout << a * (c - s.size()) << endl;
}