[1057] 토너먼트

#include<iostream>
using namespace std;
int main()
{
	int total, kim, im, count = 0;
	cin >> total >> kim >> im;
	
	if (total < kim || total < im)
	{
		count = -1;
	}
	else
	{
		while (kim != im)
		{
			kim = (kim + 1) / 2;
			im = (im + 1) / 2;
			count++;
		}
	}
	cout << count << endl;
	return 0;
}