#include<iostream>
using namespace std;
double umnozak(int);
void main()
{
	int n;
	double p = 1;
	cout << "Unesite prirodan broj: ";
	cin >> n;
	if (n < 0)
		n--;


	cout << umnozak(n);
}
double umnozak(int n)
{
	double p = 1;
	for (int i = 1; i <= n; i++)
		p *= cos(i) / sin(i) *cos(i) + cos(i) / sin(i) + sin(i);
	return p;


}