#include<iostream>
using namespace std;

int main()
{
	cout.precision(15);
	double x, tolerance = 1e-8;

	cout << " Enter x: ";
	cin >> x;

	int i=1;
	double term = x;
	double sum = x;
	while (abs(term) > tolerance)
	{
		term = - term * x * x / ((i+1) * (i+2));
		sum = sum + term;
		i = i + 2;
	}
	cout << " sin(x) = " << sum << endl;
}