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

int main(){
	FILE *pFile=NULL;
	pFile =fopen("acoups.out","w");
	int N,n,P=1000,m;
	double x,y,theta;
	double pi=acos(-1.0L);
	printf("Nombre de demi-tours ?\n");
	if(scanf("%d",&N)==1);

	for (n=1;n<=N;n+=2){
		for(m=0;m<=P;m++){
			theta=0;
			x=0;
			y=0;
			fprintf(pFile,"%lf\t%lf\n",x,y);
		}
	}

	for (n=2;n<=N;n+=2){
		for(m=0;m<=P;m++){
			theta=0;
			x=0;
			y=0;
			fprintf(pFile,"%lf\t%lf\n",x,y);
		}
	}
	return 0;
}