#include<stdio.h>

int sol;

void recur(int k,int x,int y)
{
    if(!k)
        return ;
    int l=(1<<(k-1));
    if(x<=l && y<=l)
        recur(k-1,y,x);
    if(x>l && y<=l)
    {
        sol+=l*l;
        recur(k-1,x-l,y);
    }
    if(x>l && y>l)
    {
        sol+=2*l*l;
        recur(k-1,x-l,y-l);
    }
    if(x<=l && y>l)
    {
        sol+=3*l*l;
        recur(k-1,2*l-y+1,l-x+1);
    }

}

int main ()
{
    int k,x,y;
    freopen("fractal.in","r",stdin);
    freopen("fractal.out","w",stdout);
    scanf("%d%d%d",&k,&x,&y);
    recur(k,y,x);
    printf("%d\n",sol);
    return 0;
}