ConsoleApp10

// 123.cpp : Defines the entry point for the console application.
//

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

using namespace std;


int main()
{
	int k, i, p, u;
	double s=0, w;
	cout << "k= ";
	cin >> k;
	for (i=1; i<=k; i++)
	{	p=1;
		for (u=1; u<=i+1; u++)
		{
			p *= u;
		}
		cout << "fact" << i+1 << "= "<< p << endl;
			if (i != 2)
				{w = pow(-1., i)*p/(i*i-4);
			s+=w;}




	}
	cout << "w= " << s << endl;
	system("pause");

	return 0;
}