diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..ab1f416
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000..a590144
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="WS-07-Multithreading-Basics-and-Hashing" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/encodings.xml b/.idea/encodings.xml
new file mode 100644
index 0000000..aa00ffa
--- /dev/null
+++ b/.idea/encodings.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
new file mode 100644
index 0000000..4158879
--- /dev/null
+++ b/.idea/jarRepositories.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://maven.devneeds.ir/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..eba6e1f
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" project-jdk-name="25" project-jdk-type="JavaSDK" />
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/main/java/dev/Main.java b/src/main/java/dev/Main.java
index 01163d0..a4a9ffe 100644
--- a/src/main/java/dev/Main.java
+++ b/src/main/java/dev/Main.java
@@ -4,7 +4,6 @@ import dev.service.StudentManager;
 import dev.thread.StudentLoader;
 import dev.utils.FileManager;
 
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Scanner;
 
@@ -12,6 +11,8 @@ public class Main {
 
     public static void main(String[] args) throws Exception {
 
+        boolean once = true;
+
         Scanner scanner = new Scanner(System.in);
 
         StudentManager manager = new StudentManager();
@@ -37,37 +38,46 @@ public class Main {
 
                 case 1 -> {
 
-                    List<String> data = FileManager.loadStudents("students.txt");
+                    if(once){
+                        List<String> data = FileManager.loadStudents("students.txt");
 
-                    int n = data.size();
+                        int n = data.size();
 
-                    List<String> part1 = data.subList(0 , n/3 );
+                        List<String> part1 = data.subList(0 , n/3 );
 
-                    List<String> part2 = data.subList(n/3 , (2*n)/3);
+                        List<String> part2 = data.subList(n/3 , (2*n)/3);
 
-                    List<String> part3 = data.subList((2*n)/3 , n);
+                        List<String> part3 = data.subList((2*n)/3 , n);
 
 
 
-                    StudentLoader t1 = new StudentLoader(part1);
+                        StudentLoader t1 = new StudentLoader(part1);
 
-                    StudentLoader t2 = new StudentLoader(part2);
+                        StudentLoader t2 = new StudentLoader(part2);
 
-                    StudentLoader t3 = new StudentLoader(part3);
+                        StudentLoader t3 = new StudentLoader(part3);
 
-                    t1.start();
-                    t2.start();
-                    t3.start();
+                        t1.start();
+                        t2.start();
+                        t3.start();
 
-                    t1.join();
-                    t2.join();
-                    t3.join();
+                        t1.join();
+                        t2.join();
+                        t3.join();
 
-                    manager.addStudents(t1.getStudents());
-                    manager.addStudents(t2.getStudents());
-                    manager.addStudents(t3.getStudents());
+                        manager.addStudents(t1.getStudents());
+                        manager.addStudents(t2.getStudents());
+                        manager.addStudents(t3.getStudents());
 
-                    System.out.println("Loading Done");
+                        System.out.println("Loading Done");
+                        once = false;
+
+
+
+                    }
+                    else {
+                        System.out.println("you have load students befor");
+                    }
 
 
                 }