#include <iostream>
#include<cmath>
using namespace std;

float suma(int);
int faktorijel(int);

int main()
{
	int n;
	int sum = 0;
	cout << "Unesite broj: " << endl;
	cin >> n;
	cout << "Suma je: " << suma(n) << endl;
	system("PAUSE");
	return 0;
}

float suma(int n)
{
	float sum = 0;
	for (int i = 1; i <= n; i++)
	{
		sum = sum +(pow(-1, i-1)* i / faktorijel(i));
	}
	return sum;
}

int faktorijel(int n)
{
	int faktor = 1;
	{
		for (int i = 1; i <= n; i++)
		{
			faktor = faktor*i;
		}
	}
	return faktor;
}