#include <iostream>
#include <vector>
#include <algorithm>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)
#define dump(s) cerr << __LINE__ << "\t:" << #s << " = " << (s) << endl
    
using namespace std;

int main () {
    long long P1, P2;
    cin >> P1 >> P2;
    int N;
    cin >> N;
    vector<int> R(1000, 0);
    REP (i, 0, N) {
	int Ri;
	cin >> Ri;
	R[Ri]++;
    }
    long long ans = 0;
    for (auto &r : R) {
	if (r > 1) {
	    ans += (r - 1) * (P1 + P2);
	}
    }
    cout << ans << endl;
    
    return 0; 
}