A8933. Point on Spiral

Valera the horse lives on a plane. The Cartesian coordinate system is defined on this plane. Also an infinite spiral is painted on the plane. The spiral consists of segments: $[(0,0),(1,0)]$ , $[(1,0),(1,1)]$ , $[(1,1),(-1,1)]$ , $[(-1,1),(-1,-1)]$ , $[(-1,-1),(2,-1)]$ , $[(2,-1),(2,2)]$ and so on. Thus, this infinite spiral passes through each integer point of the plane.

Valera the horse lives on the plane at coordinates $(0,0)$ . He wants to walk along the spiral to point $(x,y)$ . Valera the horse has four legs, so he finds turning very difficult. Count how many times he will have to turn if he goes along a spiral from point $(0,0)$ to point $(x,y)$ .

The first line contains two space-separated integers $x$ and $y$ $(|x|,|y|<=100)$ .

Print a single integer, showing how many times Valera has to turn.