#include <stdio.h>
#include <sys/wait.h>
#include <sys/types.h>
main()
{
  int k, status;
  int num;
  int num1;
  int num2;
  int num3;
  int num4;
  int char;

  printf("I'm the original process. PID=%d, PPID=%d.\n", getpid(), getppid());

  num=fork();

  if ( num !=0 )
   {
     waitpid (num2, &status, WUNTRACED);
     printf("I'm the parent (P0).PID=%d, PPID=%d.\n", getpid(), getppid());
     printf("I have a child (P1) with PID %d.\n", num);
     num1=fork();
  if ( num1 !=0 ) {
printf("I'm the parent (P1).PID=%d, PPID=%d.\n", getpid(), getppid());
  }
else {
printf("I'm the new child (P2). PID=%d, PPID=%d.\n", getpid(), getppid());
num2=fork();
 if ( num2 !=0 )
   k=wait(&status);
   {
     printf("I'm the parent (P2).PID=%d, PPID=%d.\n", getpid(), getppid());
     printf("I'm the first child (P3) with PID %d.\n", num2);
num3=fork();
if ( num3 !=0 ) {
k=wait(&status);
printf("I'm the parent (P2).PID=%d, PPID=%d.\n", getpid(), getppid()) ;
}
else {
printf("I'm the second child (P4). PID=%d, PPID=%d.\n", getpid(), getppid());
num4=fork();
if ( num4 !=0 ) {
printf("I'm the parent (P2).PID=%d, PPID=%d.\n", getpid(), getppid());
}
else {
printf("I'm the third child (P5). PID=%d, PPID=%d.\n", getpid(), getppid());
}
 }
 }
 }
  }
  else
   {
     printf("I'm the child. PID=%d, PPID=%d.\n", getpid(), getppid());
   }
  printf("PID %d terminates.\n", getpid());

}