public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  long k = sc . nextLong ( ) ;
  int [ ] a = new int [ n ] ;
  int [ ] b = new int [ n ] ;
  List < Pair > pairs = new ArrayList < Pair > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
    b [ i ] = sc . nextInt ( ) ;
    pairs . add ( new Pair ( a [ i ] , b [ i ] ) ) ;
  }
  Collections . sort ( pairs ) ;
  long cnt = 0 ;
  sc . close ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int value = pairs . get ( i ) . value ;
    cnt += value ;
    if ( cnt >= k ) {
      System . out . println ( pairs . get ( i ) . key ) ;
      return ;
    }
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; long k = sc . nextLong ( ) ; int [ ] a = new int [ n ] ; int [ ] b = new int [ n ] ; List < Pair > pairs = new ArrayList < Pair > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = sc . nextInt ( ) ; b [ i ] = sc . nextInt ( ) ; pairs . add ( new Pair ( a [ i ] , b [ i ] ) ) ; } Collections . sort ( pairs ) ; long cnt = 0 ; sc . close ( ) ; for ( int i = 0 ; i < n ; i ++ ) { int value = pairs . get ( i ) . value ; cnt += value ; if ( cnt >= k ) { System . out . println ( pairs . get ( i ) . key ) ; return ; } } }
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