diff --git a/Seminar 3/code/ThirdSeminar/.idea/.gitignore b/Seminar 3/code/ThirdSeminar/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/Seminar 3/code/ThirdSeminar/.idea/.gitignore	
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/Seminar 3/code/ThirdSeminar/.idea/misc.xml b/Seminar 3/code/ThirdSeminar/.idea/misc.xml
new file mode 100644
index 0000000..03f397c
--- /dev/null
+++ b/Seminar 3/code/ThirdSeminar/.idea/misc.xml	
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_19" default="true" project-jdk-name="19" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Seminar 3/code/ThirdSeminar/.idea/modules.xml b/Seminar 3/code/ThirdSeminar/.idea/modules.xml
new file mode 100644
index 0000000..23c9bfe
--- /dev/null
+++ b/Seminar 3/code/ThirdSeminar/.idea/modules.xml	
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/ThirdSeminar.iml" filepath="$PROJECT_DIR$/ThirdSeminar.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/Seminar 3/code/ThirdSeminar/.idea/vcs.xml b/Seminar 3/code/ThirdSeminar/.idea/vcs.xml
new file mode 100644
index 0000000..c2365ab
--- /dev/null
+++ b/Seminar 3/code/ThirdSeminar/.idea/vcs.xml	
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../../.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/Seminar 3/code/ThirdSeminar/ThirdSeminar.iml b/Seminar 3/code/ThirdSeminar/ThirdSeminar.iml
new file mode 100644
index 0000000..c90834f
--- /dev/null
+++ b/Seminar 3/code/ThirdSeminar/ThirdSeminar.iml	
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/Seminar 3/code/ThirdSeminar/out/production/ThirdSeminar/Main.class b/Seminar 3/code/ThirdSeminar/out/production/ThirdSeminar/Main.class
new file mode 100644
index 0000000..32e8db5
Binary files /dev/null and b/Seminar 3/code/ThirdSeminar/out/production/ThirdSeminar/Main.class differ
diff --git a/Seminar 3/code/ThirdSeminar/src/Main.java b/Seminar 3/code/ThirdSeminar/src/Main.java
new file mode 100644
index 0000000..4b27ece
--- /dev/null
+++ b/Seminar 3/code/ThirdSeminar/src/Main.java	
@@ -0,0 +1,55 @@
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) {
+//        int[] array = generateArray(10);
+//        int[] array2 = array;
+//
+//        System.out.println(array);
+//        System.out.println(array2);
+//
+//        array2[0] = 10;
+//
+//        printArray(array);
+//        System.out.println();
+//        printArray(array2);
+
+        int[] array = new int[]{0, 1, 1, 2, 0, 0, 510, 12, 5};
+
+        System.out.println(sumArray(array));
+//        Arrays.sort(array);
+//        printArray(array);
+//        int index = Arrays.binarySearch(array, 400); //always call sort before binarySearch
+//        System.out.println(index);
+    }
+
+    public static int sumArray(int[] array) {
+//        int sum = 0;
+//        for (int element : array) {
+//            sum += element;
+//        }
+
+//        return sum;
+        return Arrays.stream(array).sum();
+    }
+
+    public static int[] generateArray(int size) {
+        int[] array = new int[size];
+        for (int i = 0; i < size; i++) {
+            array[i] = i;
+        }
+        return array;
+    }
+
+    public static void printArray(int[] array) {
+//        for (int element : array) {
+//            System.out.print(element + " "); //array[i]
+//        }
+
+//        for(int i = 0; i < array.length; i++) {
+//            System.out.print(array[i] + " ");
+//        }
+
+        System.out.println(Arrays.toString(array));
+    }
+}
\ No newline at end of file