#include <iostream> 
using namespace std;
int main()
{
	int n = 1;
	double v = 1; // a[1] = 1
	while (n <= 10)
	{
		cout << "a " << n << " je " << v << endl;
		v = 2 * v + 1; // a[n] = 2 *a[n-1] +1
		n = n + 1;
	}
	cout << "Konec" << endl;
}

#include <iostream>
using namespace std;
 
int main(int argc, char** argv) {
 
	int n;
	cout << "vlozte cislo: ";
	cin >> n;
	cout << endl;
 
	int v = 1;
	for (int k = 1; k <= n; k++)
	{
		v = v * k;
	}
 
	cout << n << "! je " << v << endl;
 
	return 0;
}