private void Button_Click_16(object sender, RoutedEventArgs e)//8//16
        {
            gen b = new gen();

            b.zad16(Convert.ToInt32(textBox_Copy.Text));
        }
        private void Button_Click_13(object sender, RoutedEventArgs e)
        {
            gen b = new gen();

            b.zad13(Convert.ToInt32(textBox1.Text), Convert.ToInt32(textBox2.Text));
        }
        private void Button_Click_6(object sender, RoutedEventArgs e)//6
        {
            gen b = new gen();

            b.zad6(a);
        }