// @BEGIN_OF_SOURCE_CODE

/* @JUDGE_ID:  17243NT  155  C++  "Easy method" */

// Send to judge@uva.es

#include <iostream.h>
#include <fstream.h>
#include <iomanip.h>

#ifdef ONLINE_JUDGE
	#define ins cin
	#define outs cout
#else
	#define ins fin
	#define outs fout
	ifstream fin("myrog.in");
	ofstream fout("myrog.out");
#endif

#define MAXSIZE 512;

int main() {
	int i, x, y, c;
	int minx, maxx, miny, maxy;
	
	while(ins >> i >> x >> y) {
		if(i == 0 && x == 0 && y == 0) break;
		
		c = 0;
		minx = 1024 - i, maxx = 1024 + i;
		miny = 1024 - i, maxy = 1024 + i;
		
		for(;;) {
			if(x >= minx && x <= maxx && y >= miny && y <= maxy)
				c++;
			
			i /= 2;
			
			if(x < (minx + maxx) / 2)
				maxx = minx + i, minx = minx - i;
			else
				minx = maxx - i, maxx = maxx + i;
			
			if(y < (miny + maxy) / 2)
				maxy = miny + i, miny = miny - i;
			else
				miny = maxy - i, maxy = maxy + i;
			
			if(i == 0) break;
		}
		
		outs << setw(3) << c << endl;
	}
	
	return 0;
}

// @END_OF_SOURCE_CODE