Vector3(x,y,variable)?

Hi friends,

I'm trying to make a following camera for one of my objects (a ball) and I want one of the vectors to be a variable (like a public float I can change from everywhere), but with t$$anonymous$$s code I get an error:

     float distance = -10f;
     
     Vector3 whatever = new Vector3 (0,10,distance);

As far as I know, Vector3(float,float,float) for x,y,z but it says: A field initializer cannot reference the non-static field, method, or property.

Any help will be very welcome. Thanks!