#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <string>
#include <set>
#define INF 100000000000
using namespace std;
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define LOOP(i,N) for(int i=0;i<N;i++)
typedef pair<int,int> P;
typedef pair<int,pair<int,int> > PP;
// #define int long long
/* define/include */

int main(){
  //まっぷ　に　つっこんで　えい！ｗ
  map<int,int> ma;
  int p1,p2;
  cin >> p1;
  cin >> p2;
  int p=p1+p2;
  int n;
  cin >> n;
  for(int i=0;i<n;i++){
    int r;
    cin >> r;
    ma[r]++;
  }
  int ans=0;
  for(auto itr:ma){
    ans+=itr.second-1;
  }
  cout << ans*p << endl;


}