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