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

#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pb push_back
#define x first
#define y second
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (a) - 1; i >= (b); i--)

typedef long long ll;
typedef double db;
typedef long double LD;
typedef pair<int, int> pii;
typedef pair<db, db> pdd;
typedef pair<ll, ll> pll;


int solve()
{
	int n, x, y;
	if (!(cin >> n >> x >> y))
		return 1;
	
	int c = 1 << (n);
	
	vector<set<int>> v(21);
	v[0] = {c / 2};
	FOR (i, 1, 21)
	{
		for (int el: v[i - 1])
		{
			v[i].insert(el / 2);
			v[i].insert((el + c) / 2);
		}
	}
	int d1 = 47, d2 = 47;
	FOR (i, 0, 21)
	{
		if (v[i].count(x))
			d1 = min(d1, i);
		if (v[i].count(y))
			d2 = min(d2, i);
	}
	int ans = max(d1, d2);
	cout << ans << '\n';
	
	return 0;
}

int32_t main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int TET = 1e9;
	//cin >> TET;
	for (int i = 1; i <= TET; i++)
	{
		if (solve())
		{
			break;
		}
		#ifdef ONPC
			cerr << "_____________________________\n";
		#endif
	}
	#ifdef ONPC
		cerr << "\nfinished in " << clock() * 1.0 / CLOCKS_PER_SEC << " sec\n";
	#endif
	return 0;
}