Trying to create a skill macro for Starfinder

So long story short the Operative class in Starfinder gets a +1 bonus to all skill checks and initiative at level 1. This bonus increases to +2 at level 3, and gains another +1 for every four levels afterwards, so +3 at 7th, +4 at 11th, +5 at 15th and +6 at 19th. I'm trying to make a macro that will calculate this automatically based on my level, here's what I have so far, but it always gives me a result of 1 regardless of what I set class-0-level to; [[1+((0d0+@class-0-level/3)ceil(0d0+@class-0-level/4+1)kh1)]] The wisdom behind this is that at less then level 3 it will only be a 1. At level three it should be 2, and is overridden at level 7+, but I don't think got it right. Can anyone suggest a better way to do this? I need the bonus to be as follows for quick ref: 1st +1 3rd +2 7th +3 11th +4 15th +5 19th +6 Thanks in advance for any help.

You are referencing the attribute incorrectly. Attributes are referenced by @{attribute-name}, so do @{class-0-level}

There's a simpler formula that should work: [[ceil((@{class-0-level}+2)/4)]] Since ceil() always rounds up, adding 2 to the level then dividing the total by 4 gives you a +1 at level 1-2, +2 at level 3-6, +3 at levels 7-10 and so on. 

seconding GG's simpler macro, and also realized your keep highest call was also incorrect: [[1+{(0d0+@class-0-level/3),ceil(0d0+@class-0-level/4+1)}kh1]]

Ah many thanks, that's perfect. The feedback is wonderful too, I always forget the {} to be honest.