int main()
{
	int n = 5;
	float x = 2.0f;
	double sum = 1;
	long long fact = 1;
	for (int i = 2; i <= 2*n; i+=2)
	{
		for (int j = i-1; j <= i; ++j)
		{
			fact *= j;
		}
		cout << fact << '\n';
		sum += pow(x, i) / fact;
	}
	cout << sum  << '\n';

	cout << endl;
	system("pause");
	return 0;
}