#include "stdafx.h"
#include <iostream>
#include <math.h>
#include <conio.h>

using namespace std;

//int factorial(int k);
int main()
{
	double a, b, h, x, r, s;
	int n, zn = -1, k;
	setlocale(LC_ALL, "Russian");
	cout << "Введите a,b,h,n" << endl;
	cin >> a >> b >> h >> n;
	for (x = a; x <= b; x += h);
	{
		r = s = 1;
		for (k = 1; k <= n; k++);
		{
			r = zn*r*(pow((2 * x),2.) / (2 * k));
		    s += r;
		}
		cout << x << "   " << s;
	}
    _getch();
    return 0;
}

/* int factorial(int k)
{
	if (k > 1)
		return k * factorial(k - 1);
	else
		return 1;
} */