public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  int n_odd = 0 ;
  int n_even = 0 ;
  int m_odd = 0 ;
  int m_even = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int a = sc . nextInt ( ) ;
    if ( ( a & 1 ) == 0 ) n_even ++ ;
    else n_odd ++ ;
  }
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int b = sc . nextInt ( ) ;
    if ( ( b & 1 ) == 0 ) m_even ++ ;
    else m_odd ++ ;
  }
  System . out . println ( Integer . min ( n_even , m_odd ) + Integer . min ( n_odd , m_even ) ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; int n_odd = 0 ; int n_even = 0 ; int m_odd = 0 ; int m_even = 0 ; for ( int i = 0 ; i < n ; i ++ ) { int a = sc . nextInt ( ) ; if ( ( a & 1 ) == 0 ) n_even ++ ; else n_odd ++ ; } for ( int i = 0 ; i < m ; i ++ ) { int b = sc . nextInt ( ) ; if ( ( b & 1 ) == 0 ) m_even ++ ; else m_odd ++ ; } System . out . println ( Integer . min ( n_even , m_odd ) + Integer . min ( n_odd , m_even ) ) ; }
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