public static void main ( String [ ] args ) {
  FastReader fs = new FastReader ( ) ;
  int r = fs . nextInt ( ) ;
  int c = fs . nextInt ( ) ;
  int [ ] [ ] a = new int [ r ] [ c ] ;
  boolean first = false ;
  for ( int i = 0 ;
  i < r ;
  i ++ ) {
    for ( int j = 0 ;
    j < c ;
    j ++ ) {
      a [ i ] [ j ] = fs . nextInt ( ) ;
      if ( ( i == 0 || i == r - 1 || j == 0 || j == c - 1 ) && ( a [ i ] [ j ] == 1 ) ) {
        first = true ;
      }
    }
  }
  if ( first ) {
    System . out . println ( 2 ) ;
  }
  else {
    System . out . println ( 4 ) ;
  }
}

public static void main ( String [ ] args ) { FastReader fs = new FastReader ( ) ; int r = fs . nextInt ( ) ; int c = fs . nextInt ( ) ; int [ ] [ ] a = new int [ r ] [ c ] ; boolean first = false ; for ( int i = 0 ; i < r ; i ++ ) { for ( int j = 0 ; j < c ; j ++ ) { a [ i ] [ j ] = fs . nextInt ( ) ; if ( ( i == 0 || i == r - 1 || j == 0 || j == c - 1 ) && ( a [ i ] [ j ] == 1 ) ) { first = true ; } } } if ( first ) { System . out . println ( 2 ) ; } else { System . out . println ( 4 ) ; } }
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