public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  N = sc . nextInt ( ) ;
  K = sc . nextInt ( ) ;
  w = new double [ N ] ;
  v = new double [ N ] ;
  y = new double [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    w [ i ] = sc . nextInt ( ) ;
    int p = sc . nextInt ( ) ;
    v [ i ] = w [ i ] * p / 100.0 ;
  }
  double lb = 0.0 ;
  double ub = 1000.0 ;
  for ( int loop = 0 ;
  loop < 100 ;
  loop ++ ) {
    double mid = ( lb + ub ) / 2 ;
    if ( calc ( mid ) ) lb = mid ;
    else ub = mid ;
  }
  System . out . println ( lb * 100.0 ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; N = sc . nextInt ( ) ; K = sc . nextInt ( ) ; w = new double [ N ] ; v = new double [ N ] ; y = new double [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { w [ i ] = sc . nextInt ( ) ; int p = sc . nextInt ( ) ; v [ i ] = w [ i ] * p / 100.0 ; } double lb = 0.0 ; double ub = 1000.0 ; for ( int loop = 0 ; loop < 100 ; loop ++ ) { double mid = ( lb + ub ) / 2 ; if ( calc ( mid ) ) lb = mid ; else ub = mid ; } System . out . println ( lb * 100.0 ) ; }
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