#include <stdio.h>
#include <math.h>

void X(int N){
	int x,y;
	for(y=0;y<=N;y++){
		for(x=0;x<=N;x++){
			if(y==x || y==-x+N)
				printf("*");
			else 
				printf(" ");
		}
		printf("\n");
	}
}
void K(int N){
	int x,y;
	for(y=0;y<=N;y++){
		for(x=0;x<=N;x++){
			if(y==int(0.5*(double)x+(double)N*0.5) || x==0 || y==int(-0.5*(double)x+(double)N*0.5))
				printf("*");
			else 
				printf(" ");
		}
		printf("\n");
	}
}
void O(int N){
	int x,y; double r;
	r=0.5*(double)N;
	for(y=0;y<=N;y++){
		for(x=0;x<=N;x++){
			if(y==int(sqrt(r*r-((double)x-r)*((double)x-r))+r) || y==int(-1.0*sqrt(r*r-((double)x-r)*((double)x-r))+r))
				printf("*");
			else 
				printf(" ");
		}
		printf("\n");
	}
}
void main(void)
{
	X(20);//表示させたい段数を引数に
	printf("\n");
	K(20);
	printf("\n");
	O(20);
}