Any value between 0 and - 1/3 will do. 0 is the largest possible number, but should not be included in your choices. You could try -1/6. The value of that is -0.166667 which by an oddity of our number system is larger than -1/3 but less than 0.
-1/12 is also possible which is - 0.08333
A third would be - 1/16 which is -0.0625.