import core.bitop, std.algorithm, std.ascii, std.bigint, std.conv, std.math,
    std.functional, std.numeric, std.range, std.stdio, std.string, std.random,
    std.typecons, std.container, std.format;

// dfmt off
T lread(T = long)(){return readln.chomp.to!T();}
T[] aryread(T = long)(){return readln.split.to!(T[])();}
void scan(TList...)(ref TList Args){auto line = readln.split();
foreach (i, T; TList){T val = line[i].to!(T);Args[i] = val;}}
alias sread = () => readln.chomp();enum MOD = 10 ^^ 9 + 7;
alias PQueue = BinaryHeap!(Array!long, "a<b");
// dfmt on

void main()
{
    long x, y;
    scan(x, y);
    () {
        if (x == y)
            return 0;
        if (x == -y)
            return 1;
        if (0 <= x && x < y)
            return y - x;
        if (x < 0 && y < 0) // b -> a -> b
            return abs(y - x) + 2;

        // 0 <= x
        if (y < 0 && x < abs(y)) // a -> b
            return abs(y) - x + 1;
        if (y < 0 && abs(y) < x) // b -> a
            return x - abs(y) + 1;

        return -1;
    }().writeln();
}
