public static void main ( String [ ] args ) {
  int a , b , ji1 = 0 , ji2 = 0 , ou1 = 0 , ou2 = 0 ;
  Scanner reader = new Scanner ( System . in ) ;
  a = reader . nextInt ( ) ;
  b = reader . nextInt ( ) ;
  int i , x ;
  for ( i = 0 ;
  i < a ;
  ++ i ) {
    x = reader . nextInt ( ) ;
    if ( x % 2 == 1 ) ji1 ++ ;
    else ou1 ++ ;
  }
  for ( i = 0 ;
  i < b ;
  ++ i ) {
    x = reader . nextInt ( ) ;
    if ( x % 2 == 1 ) ji2 ++ ;
    else ou2 ++ ;
  }
  if ( ji1 > ou2 ) ji1 = ou2 ;
  if ( ji2 > ou1 ) ji2 = ou1 ;
  System . out . println ( ji1 + ji2 ) ;
}

public static void main ( String [ ] args ) { int a , b , ji1 = 0 , ji2 = 0 , ou1 = 0 , ou2 = 0 ; Scanner reader = new Scanner ( System . in ) ; a = reader . nextInt ( ) ; b = reader . nextInt ( ) ; int i , x ; for ( i = 0 ; i < a ; ++ i ) { x = reader . nextInt ( ) ; if ( x % 2 == 1 ) ji1 ++ ; else ou1 ++ ; } for ( i = 0 ; i < b ; ++ i ) { x = reader . nextInt ( ) ; if ( x % 2 == 1 ) ji2 ++ ; else ou2 ++ ; } if ( ji1 > ou2 ) ji1 = ou2 ; if ( ji2 > ou1 ) ji2 = ou1 ; System . out . println ( ji1 + ji2 ) ; }
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