public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int cases = scan . nextInt ( ) ;
  int counts [ ] = new int [ 1001 ] ;
  for ( int i = 0 ;
  i < cases ;
  i ++ ) {
    counts [ scan . nextInt ( ) ] ++ ;
  }
  int countsInaRow = 0 ;
  for ( int i = 0 ;
  i < counts . length ;
  i ++ ) {
    if ( counts [ i ] > 0 ) {
      countsInaRow ++ ;
    }
    else {
      countsInaRow = 0 ;
    }
    if ( countsInaRow == 3 ) {
      break ;
    }
  }
  if ( countsInaRow == 3 ) {
    System . out . println ( "YES" ) ;
  }
  else {
    System . out . println ( "NO" ) ;
  }
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int cases = scan . nextInt ( ) ; int counts [ ] = new int [ 1001 ] ; for ( int i = 0 ; i < cases ; i ++ ) { counts [ scan . nextInt ( ) ] ++ ; } int countsInaRow = 0 ; for ( int i = 0 ; i < counts . length ; i ++ ) { if ( counts [ i ] > 0 ) { countsInaRow ++ ; } else { countsInaRow = 0 ; } if ( countsInaRow == 3 ) { break ; } } if ( countsInaRow == 3 ) { System . out . println ( " YES " ) ; } else { System . out . println ( " NO " ) ; } }
(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: (integral_type) 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) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (decimal_integer_literal))))) (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: (block (expression_statement (update_expression (array_access array: (identifier) index: (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: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (field_access object: (identifier) field: (identifier))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (break_statement))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))))))