#include <bits/stdc++.h>

using namespace std;

int main() {
    int p1, p2, n;
    std::unordered_map<int, int> ump ;
    
    cin >> p1 >> p2 >> n;
    
    int tmp;
    for (int i = 0; i < n; i++) {
        cin >> tmp;
        ump[tmp]++;
    }
    
    int ct = 0;
    for (auto i : ump) {
        if (i.second >= 2) {
            ct += i.second - 1;
        }
    }
    
    int ans = (p1 + p2) * ct;
    
    cout << ans << endl;
    
    return 0;
}