#include <algorithm>
#include <iostream>
using namespace std;
int main(){
int P1,P2,N;
cin>>P1>>P2>>N;
int* rn = new int[N];
for(int x=0;x<N;x++){
	cin>>rn[x];
}
sort(rn,rn+N);
int doubles=0;
N--;
for(int x=0;x<N;x++){
	if(rn[x]==rn[x+1]){
		doubles++;
	}
}
cout<<doubles*(P1+P2);
return 0;
}