#include <iostream>
using namespace std;

int main()
{
    int p1,p2,n;
    cin >> p1 >> p2 >> n;
    int r,flag[1000] = {},ans = 0;
    for(int i = 0; i < n; i++){
        cin >> r;
        if(flag[r] == 1) ans++;
        else flag[r]++;
    }

    cout << (p1 + p2) * ans << endl;

    return 0;
}