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

#define EPS 1e-6

typedef struct
{
   double x;
   double y;
   double R;
   int state;
} point;

void init (point *, int);
double distance (point * pa, point * pb);

int main()
{
   point * p;
   int size;
   double d;
   double MIN;
   int ind, ind2;
   int i, j, k;
   double a;


   FILE * f = fopen ("input.txt","r");
   for (size = 0; fscanf (f,"%lf", &a) == 1 ; ++size);
   if (size % 2 != 0)
   {
        printf ("Incorrect data\n");
        return -1;
   }
   size /= 2;
   if (size == 1)
   {
      printf ("Incorrect data\n");
      return -1;
   }
   rewind (f);
   point = p[size];
   for (i = 0; i < size; ++i)
   {
      fscanf (f, "%lf %lf", &p[i].x, &p[i].y);
   }
   fclose (f);

   init (p, size);
   /*MIN = sqrt (pow (buble[0].x - buble[1].x, 2) + pow (buble[0].y - buble[1].y, 2)) / 2;
   printf ("1st distance = %lf\n", MIN);*/

   for (k = 0; k < size; ++k)
   {
      MIN = 0;
      for (i = 0; i < size ; ++i)
      {
        if (p[i].status == 1)
        {
           for (j = 0; j < size; ++j)
           {
              if (i != j)
              {
                 d = distance(p[i], p[j]);
                 if (buble[j].status == 0)
                 {
                    d = d - p[j].R;
                 }
                 else
                 {
                    d /= 2;
                 }
                 if (MIN == 0)
                 {
                     MIN = d;
                     ind = i;
                 }
                 else if (d < MIN)
                 {
                     MIN = d;
                     ind = i;
                     ind2 = j; // mojno dobavit index j i potom buble[j].status = 0
                 }
                 //printf ("rassto9nie ot i%d do j%d minimalno i = %lf\n",i, j, MIN);
              }
           }
        }
      }//
      p[ind].R = MIN;
      p[ind].status = 0;
      if (p[ind2].status == 1)
      {
        p[ind2].R = MIN;
        p[ind2].status = 0;
      }
   }//

   for (int i = 0; i < size; ++i){
      printf ("X%d (%lf, %lf) R = %lf\n", i, p[i].x, p[i].y, p[i].R);
   }
   delete [] p;
   return 0;
}

void init (Buble *buble, int size)
{
   for (int i = 0; i < size; ++i)
   {
      buble[i].R = 0;
      buble[i].status = 1;
   }
}

double distance (point * pa, point * pb)
{
    double dx = pa->x - pb->x;
    double dy = pa->y - pb->y;

    return sqrt(dx*dx + dy*dy);
}