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

int main(){
  int p1,p2,n;
  cin >> p1 >> p2 >> n;
  int room[10000];
  int num;
  for(int i=0;i<10000;i++){
    room[i]=0;
  }
  for(int i=0;i<n;i++){
    cin >> num;
    room[num]++;
  }
  num=0;
  for(int i=0;i<10000;i++){
    if(room[i]>1)num+=room[i]-1;
  }
  cout << (p1+p2)*num << endl;
  return 0;
}