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What is the highest order of interference maximum that can occur when monochromatic light with a wavelength of 560 nm illuminates a diffraction grating with 4000 lines/cm?

Attempt:

I thought this seemed really easy, but my answer was incorrect.

λ=560nm

Since there are 4000 lines per centimeter - I solved for the distance between two slits to be 2.5*10^-6 meters.

Using I=mλ/d and m=1 to to achieve the max I got 0.224 but that was incorrect

I think I've made a silly error but I'm not sure what it is - can someone point me in a direction