#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include <random>
#include<map>
#include <iomanip>
#include <time.h>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
#include <cassert>
#include<fstream>
#include <unordered_map>  
using namespace std;
#define eps 0.00000001
#define LONG_INF 10000000000000000
#define GOLD 1.61803398874989484820458
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
long long dp[100000] = {};
int main() {
	long long n, c, v;
	cin >> n >> c >> v;
	long long ans = 10000000000000;
	for (int i = 2;i <= n*2;++i) {
		dp[i] = 1000000000000;
		map<int, int> hoge;
		for (int j = 1;j <= sqrt(n);++j) {
			if (i%j == 0) {
				hoge[j] = true;
				if(j != 1) hoge[i / j] = true;
			}
		}
		for (auto q = hoge.begin();q != hoge.end();++q) {
			int wow = q->first;
			dp[i] = min(dp[i], dp[wow] + c + ((i-wow) / wow)*v);
		}
		if (i >= n) ans = min(ans, dp[i]);
	}
	cout << ans << endl;
	return 0;
}