lib C
  fun strtoll(s : UInt8*, p : UInt8**, b : Int32) : Int64
end

class String
  def to_i64
    C.strtoll(self, nil, 10)
  end
end

n, m = read_line.split.map(&.to_i)
a = (1..n).map { read_line.split.map(&.to_i) }
puts [false, true].repeated_permutations(n + 2).min_of { |flag|
  cnt = flag.count(true)
  if cnt + n < m
    10**9
  else
    b = [0] * n
    sum = 0
    (0...n).each { |i|
      (0...n).each { |j|
        if flag[i] || (flag[-2] && i == j) || (flag[-1] && i == (n - 1 - j))
          sum += a[i][j]
        else
          b[j] += a[i][j]
        end
      }
    }
    if cnt >= m
      sum
    else
      sum + b.sort[0, m - cnt].sum
    end
  end
}