xml. How to display elements in a particular node without their children?

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Stels0072017-12-18 00:56:17

XML

Stels007, 2017-12-18 00:56:17

Hello! I really ask for help. I rummaged through the entire Internet, I saw 1000 codes, but I did not find the one I needed. The question is:
There is an xml file structure:

<?xml version="1.0" encoding="UTF-8"?>
-<head>
-<Klassi>
<klass>Класс 1</klass>
<klass>Класс 2</klass>
<klass>Класс 3</klass>
<klass>Класс 4</klass>
<klass>Класс 5</klass>
-<klass>Класс 7<gruppa>А</gruppa><gruppa>Б</gruppa><gruppa>В</gruppa></klass></Klassi></head>

I need to count only the elements related directly to the "Klassi" element, i.e. the values of all the "klass" elements, but it turns out that the subelements are also read. This is the vulgar output I manage to get:
"Class 1 Class 2 Class 3 Class 4 Class 5 Class7ABV". Yes, I don’t need ABC, I only need class numbers and that’s it. A mockery of pure water, colleagues! Help me please!
Here is my code:

XmlDocument doc = new XmlDocument();
                    doc.Load("C:\\Gruppi.xml");

                    XmlNodeList nodeList = doc.SelectNodes("head/Klassi/klass");

                    listBox1.Items.Clear();
                    foreach (XmlNode node in nodeList)
                    {
                        listBox1.Items.Add(node.InnerText);
                    }

Ps I don’t know where to cry!

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DevMan, 2017-12-18
@Stels007

//Klassi/*/text()