#include "bits/stdc++.h"
using namespace std;

#define DEBUG(x) cout<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cout<<#v<<":";for(int i=0;i<v.size();i++) cout<<" "<<v[i]; cout<<endl

typedef long long ll;
#define vi vector<int>
#define vl vector<ll>
#define vii vector< vector<int> >
#define vll vector< vector<ll> >
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
#define pll pair<ll,ll>
const int inf = 1000000001;
const ll INF = 1e18 * 4;
#define MOD 1000000007
#define mod 1000000009
#define pi 3.14159265358979323846
#define Sp(p) cout<<setprecision(15)<<fixed<<p<<endl;
int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 };
int dx2[8] = { 1,1,0,-1,-1,-1,0,1 }, dy2[8] = { 0,1,1,1,0,-1,-1,-1 };

int main() {
	int p1, p2, n;
	cin >> p1 >> p2 >> n;
	int i;
	vi r(n);
	for (i = 0; i < n; i++) {
		cin >> r[i];
	}
	sort(r.begin(), r.end());
	int pre = 0, cnt = 1;
	int sum = 0;
	for (i = 0; i < n; i++) {
		if (r[i] != pre) {
			sum += cnt - 1;
			pre = r[i];
			cnt = 1;
		}
		else {
			cnt++;
		}
	}
	sum += cnt - 1;
	cout << (p1 + p2)*sum << endl;
	return 0;
}