#include<cstdio>
int x,k,y,l,r=3,p=1,i;
int main()
{FILE *f=fopen("fractal.in","r"),*g=fopen("fractal.out","w");
fscanf(f,"%d%d%d",&k,&x,&y);
while(k)
     {k--;
     if(x>(1<<k))
           if(y>(1<<k))
                  l=l+2*(1<<k)*(1<<k),x-=(1<<k),y-=(1<<k);
           else
                  l=l+r*(1<<k)*(1<<k),x-=(1<<k);
     else
           if(y>(1<<k))
                  l=l+p*(1<<k)*(1<<k),y-=(1<<k);
           else
                  i=r,r=p,p=i;}
fprintf(g,"%d",l);
return 0;}