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

#define FOR(i,l,r) for(int i = int(l);i < int(r);i++)
template<typename T> bool chmax(T& a,const T& b){ return a < b ? (a = b,true) : false; }
template<typename T> bool chmin(T& a,const T& b){ return b < a ? (a = b,true) : false; }
typedef long long ll;

ll N,C,V;
const ll INF = 1e18;

int main()
{
	cin >> N >> C >> V;

	ll ans = INF;
	for(ll i = 1,j = 1;i <= N;i *= 2,j++){
		ll x = max(0ll,N - (1 << (j - 1)));
		chmin(ans,j * C + (j - 1) * V + (x + (i - 1)) / i * V);
	}
	cout << ans << endl;

	return 0;
}