Expression Help. 'Every 3 frames move right 1 pixel'?

Hello,
Im trying to solve an issue i am having with aliasing on sliding text.
I would like to drop an expression on my text layer (bitpmap).
ie, i want to slide the text 30 pixels over 90 frames.
If i do that using simple keyframes, the text blurs a bit when not on an whole number frame( 30.3)
Is there an expression i can use so that the text is moved one whole pixel, but not until 3 frames has passed?
Thanks very much for any help!
QMP

X=Math.floor(timeToFrames(time)/3);
Y=position[1];
[X,Y]
Mylenium

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