#include <iostream>
using namespace std;
void main()
{
	int start, finish, fact;
	cout << "vvedit finish" << endl;
	cin >> finish;
	start = 0;
	fact = 1;
	for (int i = start; i <= finish; i++)
	{
		if (i % 2 == 1)
			fact = fact*i;
	}
	cout << "factorial neparnyh chysel = " << fact << endl;
}