read -n1 s&&. ./* $[{a+,m|}=8**s/8]
b=a+8**t
o=b\&m*5
_[c=c+1&4?c-3:~(c|c*2|c*4)&292?c%8?1:c>>3:c-73,c<2],o*=c
$[h=8**{0..8},c=b-h*2,b&h*6&&_]
((o|b&b/4&m|++t>9))||echo $t