#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll f(int x,int y,int k){
	if(k < 0) return 0;
	if(x <= (1<<k) && y <= (1<<k)) return f(y,x,k-1);
	if(x <= (1<<k) && y > (1<<k)) return f(x,y-(1<<k),k-1)+(1LL<<(2*k));
	if(x > (1<<k) && y > (1<<k)) return f(x-(1<<k),y-(1<<k),k-1)+2*(1LL<<(2*k));
	return f((1<<k)-y+1,2*(1<<k)-x+1,k-1)+3*(1LL<<(2*k));
}
int K,x,y;
int main(){
	ifstream cin("fractal.in");
	ofstream cout("fractal.out");
	cin >> K >> x >> y;
	cout << f(x,y,K-1); 
}