public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  long K = sc . nextLong ( ) ;
  long [ ] map = new long [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    map [ i ] = sc . nextLong ( ) ;
  }
  Arrays . sort ( map ) ;
  int index = Arrays . binarySearch ( map , K ) ;
  if ( index >= 0 ) {
    System . out . println ( "POSSIBLE" ) ;
    return ;
  }
  if ( ~ index >= N ) {
    System . out . println ( "IMPOSSIBLE" ) ;
    return ;
  }
  for ( int i = 0 ;
  i < ( N - 1 ) ;
  i ++ ) {
    long A = map [ i ] ;
    if ( Arrays . binarySearch ( map , A + 1 ) >= 0 || Arrays . binarySearch ( map , A - 1 ) >= 0 ) {
      System . out . println ( "POSSIBLE" ) ;
      return ;
    }
    if ( Arrays . binarySearch ( map , A + A + 1 ) >= 0 || Arrays . binarySearch ( map , A - A - 1 ) >= 0 ) {
      System . out . println ( "POSSIBLE" ) ;
      return ;
    }
    if ( A > K && Arrays . binarySearch ( map , A - K ) >= 0 ) {
      System . out . println ( "POSSIBLE" ) ;
      return ;
    }
  }
  System . out . println ( "IMPOSSIBLE" ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; long K = sc . nextLong ( ) ; long [ ] map = new long [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { map [ i ] = sc . nextLong ( ) ; } Arrays . sort ( map ) ; int index = Arrays . binarySearch ( map , K ) ; if ( index >= 0 ) { System . out . println ( " POSSIBLE " ) ; return ; } if ( ~ index >= N ) { System . out . println ( " IMPOSSIBLE " ) ; return ; } for ( int i = 0 ; i < ( N - 1 ) ; i ++ ) { long A = map [ i ] ; if ( Arrays . binarySearch ( map , A + 1 ) >= 0 || Arrays . binarySearch ( map , A - 1 ) >= 0 ) { System . out . println ( " POSSIBLE " ) ; return ; } if ( Arrays . binarySearch ( map , A + A + 1 ) >= 0 || Arrays . binarySearch ( map , A - A - 1 ) >= 0 ) { System . out . println ( " POSSIBLE " ) ; return ; } if ( A > K && Arrays . binarySearch ( map , A - K ) >= 0 ) { System . out . println ( " POSSIBLE " ) ; return ; } } System . out . println ( " IMPOSSIBLE " ) ; }
(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) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (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: (block (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)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))))) (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)))) (return_statement))) (if_statement condition: (parenthesized_expression (binary_expression left: (unary_expression operand: (identifier)) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (array_access array: (identifier) index: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))) right: (decimal_integer_literal)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal)))) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) (return_statement))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (identifier) right: (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)))) (return_statement))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal))))))