#include<stdio.h>
#include <math.h>
int main()
{
  double number = 0;
  printf("Enter the number ");
  scanf("%lf",&number); 
  
  double estimate1 = number;
  double temp = estimate1*estimate1*estimate1, estimate2 =    (temp + 2.0 * number )/(temp + 0.5 * number) * estimate1 / 2.0 ;
  //printf("New estimate  : %lf condition : %lf \n",estimate2,fabs(estimate2 - estimate1));
  while( fabs(estimate2 - estimate1) > 0.01  )
  {
    estimate1 = estimate2;
    temp = estimate1*estimate1*estimate1;
    estimate2 =    (temp + 2.0 * number )/(temp + 0.5 * number) * estimate1 / 2.0 ;
    printf("New estimate  : %lf \n",estimate2);
  }
  
  printf(" Halley's Method : Cube root of %lf  is %lf \n",number,estimate2);
   
  return 0;
}