Evaluate ⌊−4−.5⌋⋅⌈4+.5⌉⋅⌊−3−.5⌋⋅⌈3+.5⌉⋅⋯⋅⌊−.5⌋⋅⌈.5⌉
The floor function means round down to the nearest integer
The ceiling function means round up to the nearest integer.
For example:
⌊−4−.5⌋=⌊−4.5⌋=−5⌈4+.5⌉=⌈4.5⌉=5
Can you take it from there?