This happens because `/` on ints returns a float. You want to use `div`
instead, which is integer division.
var maxLignes = ((nombreDePyramides + 2) * (nombreDePyramides + 3)) div 2 -
4
Or, alternatively, convert it – this is clearly the inferior solution, but
given here for completeness:
var maxLignes = int((nombreDePyramides+2)*(nombreDePyramides+3)/2-4)
In both cases, you do not need to give the type because it is derived from the
expression.
