Stop Camera Rotation

Hi, I can't figure out how to stop the camera rotation arrived at a certain angle. Imagine a man stretched out which must look right and left and his view can't go over a certain angle. I tried many solutions and this is one of them, but it's not exactly the effect I wanted to give.

 void Update () {
         if (State2 == true)
             {
                   // Camera poiting at the ceiling                
             Mytransform.localRotation = Quaternion.Euler(-65,0,0);    
                     // reverse axis 
             y += Input.GetAxis("Mouse X");
             x -= Input.GetAxis("Mouse Y");    
             Quaternion rotation = Quaternion.Euler(x, y, 0);       
                       Mytransform.localRotation *= rotation;

             if (Mytransform.localEulerAngles.y > 35f)
                 {    
                 Mytransform.localEulerAngles = new Vector3( x, 35f, 0);
                 }
             }
     }