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

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll P1, P2, N;
    cin >> P1 >> P2 >> N;

    map<ll, ll> mp;
    FOR(i, 0, N){
        ll r; cin >> r;
        mp[r]++;
    }

    ll cost_per_miss = P1 + P2;
    ll loss = 0;
    for(auto p : mp){
        ll v = p.first;
        ll count = p.second;

        if(count>1){
            loss += cost_per_miss * (count-1);
        }
    }

    p(loss);
    
    return 0;
}