#include <iostream> 
#include <stdio.h>
#include <stdlib.h>
#include <cmath>
using namespace std;
int main() { 
	double x, eps,t,s;
	cout <<" x = "; cin >> x;
	cout << " eps = "; cin >> eps;
	int k = 0;
	t = x/2;
	s = t;
	printf("%3c%8c%8c\n", 'k', 't', 's');
	printf("%3d%8e%8c\n", k, t, s);
	while (fabs(t)> eps){
		k++;
		t*= - (pow (x,2) / (4*(k+1)));
		s += t;
		printf("%3d%8e%8.2f\n", k, t, s);
	}
 
	printf("\nS=%6.3f\n", s);
 
	return 0; 
}

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