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