text: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  """\
  Test matrix product AB = C by Freivalds
  jill-jênn vie et christoph dürr - 2015-2020
  """
  
  # snip{
  from random import randint
  from sys import stdin
  
  # snip}
  __all__ = ["freivalds"]
  # snip{
  
  
  def readint():
      """
      function to read an integer from stdin
      """
      return int(stdin.readline())
  
  
  def readarray(typ):
      """
      function to read an array
      """
      return list(map(typ, stdin.readline().split()))
  
  
  # pylint: disable=redefined-outer-name
  def readmatrix(n):
      """
      function to read a matrix
      """
      M = []
      for _ in range(n):
          row = readarray(int)
          assert len(row) == n
          M.append(row)
      return M
  
  
  # pylint: disable=redefined-outer-name
  def mult(M, v):
      """
      function to multiply a matrix times a vector
      """
      n = len(M)
      return [sum(M[i][j] * v[j] for j in range(n)) for i in range(n)]
  
  
  # pylint: disable=redefined-outer-name
  def freivalds(A, B, C):
      """Tests matrix product AB=C by Freivalds
  
      :param A: n by n numerical matrix
      :param B: same
      :param C: same
      :returns: False with high probability if AB != C
  
      :complexity:
          :math:`O(n^2)`
      """
      n = len(A)
      x = [randint(0, 1000000) for j in range(n)]
      return mult(A, mult(B, x)) == mult(C, x)
  
  
  # pylint: disable=redefined-outer-name
  if __name__ == "__main__":
      n = readint()
      A = readmatrix(n)
      B = readmatrix(n)
      C = readmatrix(n)
      print(freivalds(A, B, C))
  # snip}
  