Touch screen coordinates is not same Rect class coordinates?

Hello everyone. Firstly sorry about my english. I'm developing a game for android platfom. I'm making gui controller for my game. I started to coding touch input. I have a problem with 'y' coordinate of screen for different class. Rect class is using top-left for (0,0)point of screen but touch input is using bottom-left of screen for (0,0) coordinates.

I'm making a button on GUI. My GUI.Button using my defined rectangle. Touch is using same rect for check. In this point, I have a problem.

simple example for my problem:

 public Rect rectOfMyButton;//my rect defination for use later.
 public GUIStyle myGuiStyle;
 
 void Awake(){
     //rect adjusment
     rectOfMyButton = new Rect(0, 0, 200, 200);
 }
 void Update(){
     if (Input.touchCount > 0) {
         for(int i = 0; i < Input.touchCount; i++){
             Touch toc = Input.GetTouch(i);
             if (toc.phase == TouchPhase.Began) {
                 if(rectOfMyButton.Contains(toc.position)){
                     //Do what I want
                 }
             }
             
             
         }
     }
 }
 
 void OnGUI(){
     GUI.Button(rectOfMyButton, "", myGuiStyle);
 }

I'm touching top-left of screen but game is not doing what I want. Because it's thinking rectangle is down of screen.

Here some example tutorial about this subject:

http://docs.unity3d.com/ScriptReference/Rect.html

http://unity3d.com/learn/tutorials/modules/beginner/platform-specific/multitouch-input

As a result, How can I fix this problem?