ll h,w,b,ox,oy;
char p[60][60];
double b;
void f(){
	double d=0;
	rep(y,h)rep(x,w)d+=p[y][x]%2*hypot(x-ox,y-oy);
	b<?=d;
}
{
	rd(h,w,p(h));
	b=1e99;
	ox=-1; rep(oy,h+1)f();
	ox=w;  rep(oy,h+1)f();
	oy=-1; rep(ox,w+1)f();
	oy=h;  rep(ox,w+1)f();
	wt(b);
}