public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n = input . nextInt ( ) ;
  long s = input . nextLong ( ) ;
  double a [ ] [ ] = new double [ n ] [ 2 ] ;
  TreeMap < Double , Long > map = new TreeMap < > ( ) ;
  long sum = s ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    double x = input . nextDouble ( ) ;
    double y = input . nextDouble ( ) ;
    long people = input . nextLong ( ) ;
    double key = distance ( x , y ) ;
    map . put ( key , map . getOrDefault ( key , 0L ) + people ) ;
    sum += people ;
  }
  if ( sum < 1000000 ) {
    System . out . println ( "-1" ) ;
  }
  else {
    for ( Map . Entry < Double , Long > entry : map . entrySet ( ) ) {
      Long value = entry . getValue ( ) ;
      s += value ;
      if ( s >= 1000000 ) {
        System . out . println ( entry . getKey ( ) ) ;
        return ;
      }
    }
  }
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n = input . nextInt ( ) ; long s = input . nextLong ( ) ; double a [ ] [ ] = new double [ n ] [ 2 ] ; TreeMap < Double , Long > map = new TreeMap < > ( ) ; long sum = s ; for ( int i = 0 ; i < n ; i ++ ) { double x = input . nextDouble ( ) ; double y = input . nextDouble ( ) ; long people = input . nextLong ( ) ; double key = distance ( x , y ) ; map . put ( key , map . getOrDefault ( key , 0L ) + people ) ; sum += people ; } if ( sum < 1000000 ) { System . out . println ( " - 1" ) ; } else { for ( Map . Entry < Double , Long > entry : map . entrySet ( ) ) { Long value = entry . getValue ( ) ; s += value ; if ( s >= 1000000 ) { System . out . println ( entry . getKey ( ) ) ; return ; } } } }
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