15 18 3 30 2 24 9 21 12 6 0
0
x
3
=
5
x
3
=
8
x
3
=
4
x
3
=
1
x
3
=
2
x
3
=
10
x
3
=
6
x
3
=
7
x
3
=
3
x
3
=
9
x
3
=