#include<iostream>

using namespace std;

int main(){
  int P1, P2, N;
  cin >> P1 >> P2 >> N;
  int tmp,R[999]={0};
  for(int i =0; i<N; i++){
    cin >> tmp;
    R[tmp-1]++;
  }
  int sum=0;
  for(int i=0;i<999; i++){
    if(R[i]>1){
      sum+=R[i]-1;
    }
  }
  cout << (P1+P2)*sum << endl;
  return 0;

}