public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int n = scanner . nextInt ( ) ;
  BigInteger x1 = BigInteger . valueOf ( scanner . nextLong ( ) ) ;
  BigInteger x2 = BigInteger . valueOf ( scanner . nextLong ( ) ) ;
  ArrayList < Intersection > intersections = new ArrayList < Intersection > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    BigInteger k = BigInteger . valueOf ( scanner . nextLong ( ) ) ;
    BigInteger b = BigInteger . valueOf ( scanner . nextLong ( ) ) ;
    BigInteger y1 = k . multiply ( x1 ) . add ( b ) ;
    BigInteger y2 = k . multiply ( x2 ) . add ( b ) ;
    intersections . add ( new Intersection ( y1 , y2 ) ) ;
  }
  Collections . sort ( intersections ) ;
  for ( int i = 1 ;
  i < intersections . size ( ) ;
  i ++ ) {
    if ( ( intersections . get ( i ) . y1 . subtract ( intersections . get ( i - 1 ) . y1 ) ) . signum ( ) * ( intersections . get ( i ) . y2 . subtract ( intersections . get ( i - 1 ) . y2 ) ) . signum ( ) < 0 ) {
      System . out . println ( "YES" ) ;
      return ;
    }
  }
  System . out . println ( "NO" ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int n = scanner . nextInt ( ) ; BigInteger x1 = BigInteger . valueOf ( scanner . nextLong ( ) ) ; BigInteger x2 = BigInteger . valueOf ( scanner . nextLong ( ) ) ; ArrayList < Intersection > intersections = new ArrayList < Intersection > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { BigInteger k = BigInteger . valueOf ( scanner . nextLong ( ) ) ; BigInteger b = BigInteger . valueOf ( scanner . nextLong ( ) ) ; BigInteger y1 = k . multiply ( x1 ) . add ( b ) ; BigInteger y2 = k . multiply ( x2 ) . add ( b ) ; intersections . add ( new Intersection ( y1 , y2 ) ) ; } Collections . sort ( intersections ) ; for ( int i = 1 ; i < intersections . size ( ) ; i ++ ) { if ( ( intersections . get ( i ) . y1 . subtract ( intersections . get ( i - 1 ) . y1 ) ) . signum ( ) * ( intersections . get ( i ) . y2 . subtract ( intersections . get ( i - 1 ) . y2 ) ) . signum ( ) < 0 ) { System . out . println ( " YES " ) ; return ; } } System . out . println ( " NO " ) ; }
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