[0->1] 1*21
[1->2] 1*37
[2->3] 2*24+1*2
[3->4] 3*9+2*4+1*1
[4->5] 3*16+2*2+1*1
[5->6] 5*2+3*12+2*2
[6->7] 5*4+4*1+3*3+2*1
[7->8] 6*1+5*2+3.14+2*1
[8->9] 6*5+5*3+4*1+3*4
[9->10] 5*50(6*1=9%,3*10=1%)
[10->11] 7*7
[11->12] 7*13