#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int a,b,n;
  cin>>a>>b>>n;
  int hoge,huga[1000],res=0;
  rep(i,1000)huga[i]=0;
  rep(i,n){
    cin>>hoge;
    huga[hoge]++;
  }
  rep(i,1000){
    //cout<<huga[i]<<" ";
    if(huga[i]>1)res+=(huga[i]-1)*(a+b);
  }
  cout<<res<<endl;
}