#include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
 #include <time.h>
 #include <assert.h>
 int color(double x, double y)
 {
   double t,z;
   int i,j,k;
 
   x=x/128.0-0.5;
   y=y/2048.0;
 
   t=1.0/(y+0.001);
   z=t*x;
   i=floor(t);
   j=floor(z);
   k=i+j;
   //  printf("%f %f -> %i %i %i\n",t,z,i,j,k%2);
   return ((k%2)!=0);
 }
 
 double myrand()
 {
   return rand()/((double)RAND_MAX);
 }
 
 int main()
 {
   int i,j,k,l;
   double x,y;
   printf("P5\n128 128\n255\n");
   srand(time(0));
   for(i=0;i<128;i++)
     for(j=0;j<128;j++)
       {
  	 k=0;
  	 for(l=0;l<255;l++)
 	   {
 	     x=j+myrand();
 	     y=i+myrand();
 	     k+=color(x,y);
 	   }
 	 assert(k>=0 && k<=255);
         putchar(k);
       }
 }