#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    int A, B, N;
    cin >> A >> B >> N;

    int cnt = 0;
    map<int, int> mp;
    rep(i, N) {
        int r;
        cin >> r;
        mp[r]++;
        if(mp[r]>=2)
            cnt++;
    }

    cout << (A + B) * cnt << endl;

    return 0;
}