func main()
	var x: int :: cui@inputInt()
	var y: int :: cui@inputInt()
	var l: int :: cui@inputInt()
	
	var ans: int
	if(y < 0)
		do ans :+ 2
	elif(x <> 0)
		do ans :+ 1
	end if
	do ans :+ (x.abs() + l - 1) / l
	do ans :+ (y.abs() + l - 1) / l
	do cui@print("\{ans}\n")
end func