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

signed main(){
  int p1,p2,n;cin>>p1>>p2>>n;
  map<int,int> m;
  while(n--){
    int a;cin>>a;m[a]++;
  }
  int ans=0;
  for(auto p:m)ans+=p.second-1;
  ans*=p1+p2;
  cout<<ans<<endl;
}