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

int main()
{
    int p1, p2, n;
    cin>>p1>>p2>>n;

    map<int, int> a;
    for(int r; cin>>r; ++a[r]);

    int res=0;
    for(auto& [x, y]: a) res+=(p1+p2)*(y-1);
    cout<<res<<endl;
}