#include "bits/stdc++.h"
#include "graphics.h"
using namespace std;

int main() {
	int _driver = DETECT,gm;
	initgraph(&_driver,&gm,(char*)"");
	int cen_x,cen_y,r;
	cin >> cen_x >> cen_y >> r;
	int x = r,y = 0;
	vector<pair<int,int> > points;
	putpixel(x + cen_x,y + cen_y,WHITE);
	points.push_back(make_pair(x + cen_x,y + cen_y));
	if (r > 0) {
		points.push_back(make_pair(x + cen_x,-y + cen_y));
		points.push_back(make_pair(y + cen_x,x + cen_y));
		points.push_back(make_pair(-y + cen_x,x + cen_y));
	}
	int init_p = 1 - r;
	for (; x > y; ++y) {
		if (init_p <= 0) {
			init_p = init_p + 2 * y + 1;
		} else {
			init_p = init_p + 2 * y - 2 * x + 1;
			--x;
		}
		if (x < y) break;
		points.push_back(make_pair(x + cen_x,y + cen_y));
		points.push_back(make_pair(-x + cen_x,y + cen_y));
		points.push_back(make_pair(x + cen_x,-y + cen_y));
		points.push_back(make_pair(-x + cen_x,-y + cen_y));
		if (x !=y) {
			points.push_back(make_pair(y + cen_x,x + cen_y));
			points.push_back(make_pair(-y + cen_x,x + cen_y));
			points.push_back(make_pair(y + cen_x,-x + cen_y));
			points.push_back(make_pair(-y + cen_x,-x + cen_y));
		}
	}
	sort (points.begin(),points.end());
	for (int i = 0; i < (int) points.size(); ++i) {
		putpixel(points[i].first,points[i].second,WHITE);
		delay(100);
	}
	getch();
}


//pnot => 5 / 4 - r
//pk < 0 ? pk + 1 => pk + 2 * x(k + 1) + 1
//pk > 0 ? pk + 2x(k + 1) + 1  - 2yk + 1