1 = 1ȸ
2 = 2~3ȸ
3 = 4~10ȸ
4 = 11~20ȸ
5 = 21~30ȸ

2.5 = *1+2*
5.5 = *4+5*

2.5 = *1+2*
4.5 = *3+4*