0
yes

9
yes

18
yes

1
no

10
no

19
no

-9
yes

-18
yes

-1
no

-10
no

-19
no

10000
no

9999
yes

-10000
no

-9999
yes

81
yes

80
no

-81
yes

-80
no

5000
no

4500
yes

-5000
no

-4500
yes

9996
no

9995
no

-9996
no

-9995
no