#include<stdio.h> 
long n,x,y; 
long rec(long a,long b,long k) 
{long x=0,y=0,z=0,xn=0,yn=0; 
if (k==0)return 0;  
k--;  
if(a>(1<<k)&&b>(1<<k))z=2;  
if(a>(1<<k)&&b<=(1<<k))z=1; 
if(a<=(1<<k)&&b>(1<<k))z=3;  
x=a%(1<<k);  
y=b%(1<<k);  
if(x==0)x=(1<<k);  
if(y==0)y=(1<<k);  
if(z==0)xn=y,yn=x,x=xn,y=yn;  
if(z==3)yn=(1<<k)-x+1,xn=(1<<k)-y+1,x=xn,y=yn; 
return z*(1<<k)*(1<<k)+rec(x,y,k); 
}
 
int main() 
{  
freopen("fractal.in","r",stdin); 
freopen("fractal.out","w",stdout); 
scanf("%ld%ld%ld",&n,&y,&x); 
printf("%ld\n",rec(x,y,n)); 
return 0; 
}