var y: []int
func main()
	var n: int :: cui@input().toInt(&)
	var ss: [][]char :: cui@input().split(" ")
	do @y :: #[n]int
	for i(0, n - 1)
		do @y[i] :: ss[i].toInt(&)
	end for
	do @y.sort()
	var yMin: int :: @y.min()
	var yMax: int :: @y.max()
	while(yMax - yMin > 2)
		var y1: int :: yMin + (yMax - yMin) * 1 / 3
		var y2: int :: yMin + (yMax - yMin) * 2 / 3
		if(f(y1) > f(y2))
			do yMin :: y1
		else
			do yMax :: y2
		end if
	end while
	
	var ans: int :: [f(yMin), f(yMin + 1), f(yMax + 1), f(yMin + 2)].min()
	do cui@print("\{ans}\n")
	
	func f(y: int): int
		var res: int :: 0
		for i(0, ^@y - 1)
			do res :+ (@y[i] - y).abs()
		end for
		ret res
	end func
end func