#include<bits/stdc++.h>
#define cin std::cin
#define cout std::cout
#define ciallo ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
using namespace std;
const int N=2e5+5;
int n;
ll ans,p,q;

int main(){
	freopen("money.in","r",stdin);
	freopen("money.out","w",stdout);
	ciallo
	cin>>n>>p>>q;
	ans=100000000000005;
	for(int i(0);i<=n;++i){
		ll res=i*q;
		ll k=(n-i)/(i+1ll),l=(n-i)%(i+1ll);
		res+=p*(i+1-l)*k*k+p*l*(k+1ll)*(k+1ll);
		ans=min(ans,res);
	}
	cout<<ans<<"\n";
	return 0;
}