#include<cstdio>
int x,k,y,l,z,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--,z=(1<<k);
     if(!k&&x>1&&y>1)
           {l+=2;
           break;}
     if(x>z)
           if(y>z)
                  l=l+2*z*z,x-=z,y-=z;
           else
                  l=l+3*z*z,x-=z;
     else
           if(y>z)
                  l=l+z*z,y-=z;
           else
                  i=x,x=y,y=i;}
fprintf(g,"%d",l);
return 0;}