public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int d = sc . nextInt ( ) ;
  int g = sc . nextInt ( ) / 100 ;
  int [ ] p = new int [ d ] ;
  int [ ] c = new int [ d ] ;
  for ( int i = 0 ;
  i < d ;
  i ++ ) {
    p [ i ] = sc . nextInt ( ) ;
    c [ i ] = sc . nextInt ( ) / 100 ;
  }
  memo = new int [ 105501 ] [ 1024 ] ;
  System . out . println ( solve ( d , g , p , c , 0 ) ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int d = sc . nextInt ( ) ; int g = sc . nextInt ( ) / 100 ; int [ ] p = new int [ d ] ; int [ ] c = new int [ d ] ; for ( int i = 0 ; i < d ; i ++ ) { p [ i ] = sc . nextInt ( ) ; c [ i ] = sc . nextInt ( ) / 100 ; } memo = new int [ 105501 ] [ 1024 ] ; System . out . println ( solve ( d , g , p , c , 0 ) ) ; sc . close ( ) ; }
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