#include <cstdio>
FILE *f,*g;
int k,x,y;

int sol(int k,int x,int y) {
int m,s;
if (k==0) return 0;

m=1<<(k-1); s=m*m;

if (y<=m && x<=m) return sol(k-1,y,x);
if (y>m && x<=m)  return s+sol(k-1,x,y-m);
if (y>m && x>m) return 2*s+sol(k-1,x-m,y-m);
if (y<=m && x>m) return 3*s+sol(k-1,m-y+1,2*m-x+1);
			
}

int main() {
f=fopen("fractal.in","r");
g=fopen("fractal.out","w");

fscanf(f,"%d%d%d",&k,&x,&y);
fprintf(g,"%d",sol(k,x,y));

return 0;
}