import java.util.Scanner

object Main extends App {
  val sc = new Scanner(System.in)
  val h, w = sc.nextInt
  val poses = (0 until h).map({ _ =>
    val s = sc.next
    (0 until w).filter(s(_) == '1')
  })
  Console.err.println(poses(0).mkString(" "))
  val cands = (1 to w).map((0, _)) ++ (1 to w).map((h + 1, _)) ++ (1 to h).map((_, 0)) ++ (1 to h).map((_, w + 1))
  val ans = cands.map({
    case (sy, sx) => (0 until h).map({
      cy =>
        poses(cy).map({
          cx =>
            math.sqrt(((cx + 1 - sx) * (cx + 1 - sx) + (cy + 1 - sy) * (cy + 1 - sy)).toFloat)
        }).sum
    }).sum
  }).min
  println(ans)
}