public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  n = sc . nextInt ( ) ;
  long k = sc . nextLong ( ) ;
  a = new long [ n ] ;
  b = new long [ n ] ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) a [ i ] = sc . nextLong ( ) ;
  for ( int i = 0 ;
  i < n ;
  ++ i ) b [ i ] = sc . nextLong ( ) ;
  Arrays . sort ( a ) ;
  Arrays . sort ( b ) ;
  long l = 0 , r = Long . MAX_VALUE / 2 ;
  while ( r - l > 1L ) {
    long c = ( l + r ) / 2 ;
    if ( count ( c ) < k ) l = c ;
    else r = c ;
  }
  System . out . println ( r ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; n = sc . nextInt ( ) ; long k = sc . nextLong ( ) ; a = new long [ n ] ; b = new long [ n ] ; for ( int i = 0 ; i < n ; ++ i ) a [ i ] = sc . nextLong ( ) ; for ( int i = 0 ; i < n ; ++ i ) b [ i ] = sc . nextLong ( ) ; Arrays . sort ( a ) ; Arrays . sort ( b ) ; long l = 0 , r = Long . MAX_VALUE / 2 ; while ( r - l > 1L ) { long c = ( l + r ) / 2 ; if ( count ( c ) < k ) l = c ; else r = c ; } System . out . println ( r ) ; }
(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)))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (decimal_integer_literal)))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation name: (identifier) arguments: (argument_list (identifier))) right: (identifier))) consequence: (expression_statement (assignment_expression left: (identifier) right: (identifier))) alternative: (expression_statement (assignment_expression left: (identifier) right: (identifier)))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))