n_ceil() to Ceiling()

replace n_ceil() use with Ceiling() define

code/__HELPERS/#maths.dm

@@ -74,11 +74,6 @@ GLOBAL_LIST_INIT(sqrtTable, list(1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4,
 
 	return rotated_point
 
-// Round up
-/proc/n_ceil(num)
-	if(isnum(num))
-		return round(num)+1
-
 ///Format a power value in W, kW, MW, or GW.
 /proc/display_power(powerused)
 	if(powerused < 1000) //Less than a kW

code/game/objects/items/reagent_containers/food/sandwich.dm

@@ -74,7 +74,7 @@
 
 	name = lowertext("[fullname] sandwich")
 	if(length(name) > 80) name = "[pick(list("absurd","colossal","enormous","ridiculous"))] sandwich"
-	w_class = n_ceil(clamp((ingredients.len/2),1,3))
+	w_class = Ceiling(clamp((ingredients.len/2),1,3))
 
 /obj/item/reagent_container/food/snacks/csandwich/Destroy()
 	QDEL_NULL_LIST(ingredients)

code/modules/mob/living/carbon/xenomorph/hive_status.dm

@@ -737,7 +737,7 @@
 		if(is_mainship_level(turf?.z))
 			shipside_humans_weighted_count += GLOB.RoleAuthority.calculate_role_weight(job)
 	hijack_burrowed_surge = TRUE
-	hijack_burrowed_left = max(n_ceil(shipside_humans_weighted_count * 0.5) - xenos_count, 5)
+	hijack_burrowed_left = max(Ceiling(shipside_humans_weighted_count * 0.5) - xenos_count, 5)
 	hivecore_cooldown = FALSE
 	xeno_message(SPAN_XENOBOLDNOTICE("The weeds have recovered! A new hive core can be built!"),3,hivenumber)
 

code/modules/reagents/chemistry_machinery/chem_simulator.dm

@@ -443,7 +443,7 @@
 	for(var/datum/chem_property/P in creation_template)
 		creation_cost += max(abs(P.value), 1) * P.level
 		if(P.level > 5) // a penalty is added at each level above 5 (+1 at 6, +2 at 7, +4 at 8, +5 at 9, +7 at 10)
-			creation_cost += P.level - 6 + n_ceil((P.level - 5) / 2)
+			creation_cost += P.level - 6 + Ceiling((P.level - 5) / 2)
 	creation_cost += ((new_od_level - 10) / 5) * 3 //3 cost for every 5 units above 10
 	for(var/rarity in creation_complexity)
 		switch(rarity)