#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<utility>
#define REP(i,n) for(int i = 0;i < (n);i++)
#define pb push_back
using namespace std;
const int INF = 1e9;
typedef long long ll;

int main(){
  ll p1,p2;
  cin >> p1 >> p2;
  ll n;
  cin >> n;
  ll a[1000] = {0};
  REP(i,n){
    int t;
    cin >> t;
    a[t]++;
  }
  ll sum = 0;
  REP(i,1000){
    if(a[i] != 0){
      sum+=(a[i]-1);
    }
  }
  cout << (p1+p2)*sum << endl;
  return 0;
}