#include "bits/stdc++.h"
#define MOD 1000000007
#define INF 11234567890
#define in std::cin
#define out std::cout
#define rep(i,N) for(int i=0;i<N;++i)
typedef long long int LL;

int N, C, V;
int ans;

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

	int cou = 0;
	auto N_ = N;
	while (N > 1)
	{
		N /= 2;
		++cou;
	}
	ans = (C + V)*cou + V;
	ans = std::min(ans, C + V*(N_ - 1));

	out << ans << std::endl;
	return 0;
}