public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  try {
    int in1 = Integer . parseInt ( br . readLine ( ) ) ;
    String [ ] in2 = br . readLine ( ) . split ( " " ) ;
    for ( String str : in2 ) {
      int key = Integer . parseInt ( str ) ;
      setMap ( key , 0 ) ;
      setMap ( key , + 1 ) ;
      setMap ( key , - 1 ) ;
    }
    System . out . println ( max ) ;
  }
  catch ( Exception e ) {
    System . exit ( 0 ) ;
  }
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; try { int in1 = Integer . parseInt ( br . readLine ( ) ) ; String [ ] in2 = br . readLine ( ) . split ( " ▁ " ) ; for ( String str : in2 ) { int key = Integer . parseInt ( str ) ; setMap ( key , 0 ) ; setMap ( key , + 1 ) ; setMap ( key , - 1 ) ; } System . out . println ( max ) ; } catch ( Exception e ) { System . exit ( 0 ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))))) (try_statement body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (array_type element: (type_identifier) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list (string_literal))))) (enhanced_for_statement type: (type_identifier) name: (identifier) value: (identifier) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal)))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (unary_expression operand: (decimal_integer_literal))))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (unary_expression operand: (decimal_integer_literal))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))) (catch_clause (catch_formal_parameter (catch_type (type_identifier)) name: (identifier)) body: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))))))))