diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index a7087b2..b4a665a 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -1,10 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <option name="delegatedBuild" value="true" />
+        <option name="testRunner" value="GRADLE" />
         <option name="distributionType" value="WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="1.8" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /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="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/main/kotlin/Main.kt b/src/main/kotlin/Main.kt
index 2581cde..b22b19f 100644
--- a/src/main/kotlin/Main.kt
+++ b/src/main/kotlin/Main.kt
@@ -1,6 +1,85 @@
+import java.lang.reflect.Constructor
 fun main(args: Array<String>) {
 
-    // write your code here
+    var P1 = Professor("Ahmed","AA","12345",)
+    var S1 = Student("Raghad", "Mohammed","CS100")
 
 
+}
+class Course(){
+
+    var professorOfCourse = Professor()
+    var studentInCourse = Student()
+
+    var CourseName : String =  "CS100"
+    var number_of_lectures : Int = 2
+    var students : Student = studentInCourse
+    var professor : Professor = professorOfCourse
+
+    constructor (CourseName : String,number_of_lectures : Int,studentInCourse : Student,professorOfCourse : Professor) :this()
+
+
+
+    fun numberOfStudents (studentInCourse : Student ,CourseName : String){
+
+        println(studentInCourse,CourseName)
+    }
+
+    //int numberOfStudents()
+
+    //boolean assignProfessor(Professor p) // assign professor to course. Course can have only one professor.
+    fun professorName(){
+
+        println("firstName:${firstName} lastName")
+
+    } // return professor full name
+
+
+    fun enroll() {
+
+
+        if (studentInCourse >= 20) {
+
+
+        } // assign student to this course. Student can’t be enrolled to a course if the course has 20 studens
+    }
+
+    string courseInfo() // return the course name number of lectures professor and students
+
+}
+
+class Professor(){
+
+    var Course1 = Course()
+
+    // var firstName : String = "Ahmed"
+    //var lastName: String = "AA"
+    //var telephone:String = "12345"
+    var courses: Course = Course1
+
+    constructor (firstName: String,  lastName: String,  telephone:String) : this()
+    constructor (firstName: String,  lastName: String,  telephone:String ,Course1 : Course  ) : this()
+
+    fun fullName(firstName : String , lastName: String ){
+        println("firstName:${firstName} lastName")
+
+    }
+}
+
+
+class Student(){
+
+    var Course1 = Course()
+
+    //var firstName : String = "Raghad"
+    //var lastName: String = "Mohammed"
+    var courses: Course = Course1
+
+    constructor (firstName: String , lastName: String) : this()
+    constructor (firstName: String , lastName: String ,Course1: Course) : this()
+
+    fun fullName(firstName : String , lastName: String ){
+
+        println("firstName:${firstName} lastName")
+    }
 }
\ No newline at end of file