public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  String str = s . next ( ) ;
  int max = 0 ;
  for ( int k = str . length ( ) ;
  k >= 0 ;
  k -- ) {
    for ( int start = 0 ;
    start < str . length ( ) - k ;
    start ++ ) {
      String substr = str . substring ( start , start + k ) ;
      if ( str . substring ( start + 1 ) . contains ( substr ) ) {
        max = substr . length ( ) ;
        break ;
      }
    }
    if ( max != 0 ) break ;
  }
  System . out . println ( max ) ;
  s . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; String str = s . next ( ) ; int max = 0 ; for ( int k = str . length ( ) ; k >= 0 ; k -- ) { for ( int start = 0 ; start < str . length ( ) - k ; start ++ ) { String substr = str . substring ( start , start + k ) ; if ( str . substring ( start + 1 ) . contains ( substr ) ) { max = substr . length ( ) ; break ; } } if ( max != 0 ) break ; } System . out . println ( max ) ; s . close ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (identifier))) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (identifier) right: (identifier)))))) (if_statement condition: (parenthesized_expression (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))) name: (identifier) arguments: (argument_list (identifier)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (break_statement))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (break_statement)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))