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

int main(int argc, char **argv) {
  int count = 0;

  if (fork()) {
    while (1) { 
      printf("%d\n",count++);
      sleep(1);
    }	
  } else {
    while(1) { 
      printf("%d\n",count--); 
      sleep(2);
    }
  }
}