#include<stdio.h>
int hilb(int k,int x,int y)
{
    int p=0,n;
    n=1<<k;
    if(k==0)
        return 0;
    if(x<=n/2 && y<=n/2)
        p+=hilb(k-1,y,x);
    if(x>n/2 && y<=n/2)
        p+=n*n/4+hilb(k-1,x-n/2,y);
    if(x>n/2 && y> n/2)
        p+=n*n/2+hilb(k-1,x-n/2,y-n/2);
    if(x<=n/2 && y>n/2)
        p+=3*n*n/4+hilb(k-1,n-y+1,n/2-x+1);
    return p;
}
int main()
{
    freopen("fractal.in","r",stdin);
    freopen("fractal.out","w",stdout);
    int x,y,k;
    scanf("%d%d%d",&k,&x,&y);
    printf("%d",hilb(k,x,y));
    return 0;
}