def ascan; gets.split.map(&:to_i);end

def solve(x, y, depth=0)
    return nil if depth > 4
    return 0 if x == y
    a = solve(y, x, depth+1)
    b = solve(x+y, x-y, depth+1)
    return nil if !a && !b
    return (a||b)+1 if !a || !b
    return [a,b].min+1
end

while cin = gets
    x,y = cin.split.map(&:to_i)
    p solve(x,y) || -1
end