How can I rotate the player only to -40 or -45 degrees?

float c = 0.0f; private void FixedUpdate() {     if (startRotatingBack)     {         var p = transform.eulerAngles;          if (p.y != -40)         {             p.y -= 1;             transform.eulerAngles = p;         }          c = c + 0.1f;         playerAnimator.SetFloat("Forward", c);     } } 

The problem is that the transform keeps rotating nonstop.

Maybe the problem is with this chick?

if (p.y != -40) 

I want to make that the player will rotate backward. -40 or -45 is good enough but the player the transform is eep rotating nonstop so it’s making circles instead of rotating once to -40 or to -45.