i:".#O"?0:"i/14"
f:{(~0(:)':b)*x|2*b:(2=|(:)':|x)&~x}/
+//(1+!#i)*|2=f@i
g:4(+|f@)/
s:*{2=#'x}#={^(-1_x)?*|x}{x,,g@*|x}/,i
+//(1+!#i)*|2=(*s+(-/|s)!_1e9-*s)g/i