#include <iostream>
#include <map>
using namespace std;

int main() {
    int P1, P2, N;
    cin >> P1 >> P2 >> N;
    map<int, int> m;
    int ng_cnt = 0;
    for (int i = 0; i < N; i++) {
        int r;
        cin >> r;
        if (m.find(r) != m.end()) {
            ng_cnt++;
            continue;
        }
        m[r] = 1;
    }
    cout << (P1 + P2) * ng_cnt << endl;
    return 0;
}