#include <iostream>
#include <stdlib.h>
#include <string.h>
#include <math.h> 
using namespace std;
#define MAX_DEFAULT 10
//random points in a circle

int main(int argc, char *argv[] )
{
  int j,max;
  double x,y;
  if(argc>1)max=(int)(atof(argv[1]));
  else max=MAX_DEFAULT;
  srand(time(NULL));
   for(j=0;j<max;j++){     
     //     cout << j << "\t" << (double)rand()/RAND_MAX<< endl;
     
     x=(double)rand()/RAND_MAX;
     y=(double)rand()/RAND_MAX;
     if(y<sqrt(1-x*x)){
       cout << x<<"\t"<<y<<endl;
     }
   }
  return 0;
}