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


int main()
{


	double a1 = 0.0,
		   aPrev = 0.0,
		   s = 0.0,
		   n = 0.0,
		   dif = 0.0,
		   x = 0.0,
		   c = 0.0,
		   eps = 0.00000001;


	printf("x = ");
	scanf_s("%lf", &x);
	a1 = x;
	aPrev = a1;
	n++;
	s = a1;
	do
	{
		c = (-4.0*n*n*x*x-2*n*x*x);
		s = s + aPrev*c;
		dif = aPrev*c - aPrev;
		aPrev = aPrev*c;
		printf("%.8lf\n", fabs(dif));
		n++;
	break;
	} while (fabs(dif) > eps);

	printf("Sum = %.8lf", s);

	system("pause>0");
	return 0;
}