public static void main ( String [ ] args ) {
  Scanner scn = new Scanner ( System . in ) ;
  int N = scn . nextInt ( ) ;
  long K = scn . nextLong ( ) ;
  Pair [ ] P = new Pair [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    P [ i ] = new Pair ( scn . nextLong ( ) , scn . nextLong ( ) ) ;
  }
  Arrays . sort ( P ) ;
  long ans = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    K -= P [ i ] . getB ( ) ;
    if ( K <= 0 ) {
      ans = P [ i ] . getA ( ) ;
      break ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner scn = new Scanner ( System . in ) ; int N = scn . nextInt ( ) ; long K = scn . nextLong ( ) ; Pair [ ] P = new Pair [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { P [ i ] = new Pair ( scn . nextLong ( ) , scn . nextLong ( ) ) ; } Arrays . sort ( P ) ; long ans = 0 ; for ( int i = 0 ; i < N ; i ++ ) { K -= P [ i ] . getB ( ) ; if ( K <= 0 ) { ans = P [ i ] . getA ( ) ; break ; } } System . out . println ( ans ) ; }
(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: (type_identifier) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (type_identifier) 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: (object_creation_expression type: (type_identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) (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: (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 (assignment_expression left: (identifier) right: (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list)))) (break_statement))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))