public static void main ( String [ ] args ) throws Exception {
  int n = in . readInt ( ) ;
  int [ ] [ ] cube = new int [ 3 ] [ 6 ] ;
  for ( int i = 0 ;
  i < 3 ;
  i ++ ) {
    Arrays . fill ( cube [ i ] , - 1 ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    cube [ i ] = in . readA ( ) ;
    Arrays . sort ( cube [ i ] ) ;
  }
  int [ ] digit = new int [ 10 ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 0 ;
    j < 6 ;
    j ++ ) {
      digit [ cube [ i ] [ j ] ] ++ ;
    }
  }
  for ( int i = 1 ;
  i < 100 ;
  i ++ ) {
    if ( ! check ( i , digit , cube ) ) {
      System . out . println ( i - 1 ) ;
      return ;
    }
  }
}

public static void main ( String [ ] args ) throws Exception { int n = in . readInt ( ) ; int [ ] [ ] cube = new int [ 3 ] [ 6 ] ; for ( int i = 0 ; i < 3 ; i ++ ) { Arrays . fill ( cube [ i ] , - 1 ) ; } for ( int i = 0 ; i < n ; i ++ ) { cube [ i ] = in . readA ( ) ; Arrays . sort ( cube [ i ] ) ; } int [ ] digit = new int [ 10 ] ; for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 0 ; j < 6 ; j ++ ) { digit [ cube [ i ] [ j ] ] ++ ; } } for ( int i = 1 ; i < 100 ; i ++ ) { if ( ! check ( i , digit , cube ) ) { System . out . println ( i - 1 ) ; return ; } } }
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