public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  int n = Integer . parseInt ( br . readLine ( ) ) ;
  StringTokenizer st = new StringTokenizer ( br . readLine ( ) ) ;
  int x1 = Integer . parseInt ( st . nextToken ( ) ) ;
  int x2 = Integer . parseInt ( st . nextToken ( ) ) ;
  PriorityQueue < Line > pq = new PriorityQueue < > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    st = new StringTokenizer ( br . readLine ( ) ) ;
    long k = Integer . parseInt ( st . nextToken ( ) ) ;
    long b = Integer . parseInt ( st . nextToken ( ) ) ;
    long y1 = k * x1 + b ;
    long y2 = k * x2 + b ;
    pq . add ( new Line ( y1 , y2 ) ) ;
  }
  Line x = new Line ( 1 , 2 ) ;
  Line y = new Line ( 1 , 1 ) ;
  Line prev = pq . poll ( ) ;
  while ( ! pq . isEmpty ( ) ) {
    Line cur = pq . poll ( ) ;
    if ( prev . y2 > cur . y2 ) {
      System . out . println ( "YES" ) ;
      return ;
    }
    prev = cur ;
  }
  System . out . println ( "NO" ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; int n = Integer . parseInt ( br . readLine ( ) ) ; StringTokenizer st = new StringTokenizer ( br . readLine ( ) ) ; int x1 = Integer . parseInt ( st . nextToken ( ) ) ; int x2 = Integer . parseInt ( st . nextToken ( ) ) ; PriorityQueue < Line > pq = new PriorityQueue < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { st = new StringTokenizer ( br . readLine ( ) ) ; long k = Integer . parseInt ( st . nextToken ( ) ) ; long b = Integer . parseInt ( st . nextToken ( ) ) ; long y1 = k * x1 + b ; long y2 = k * x2 + b ; pq . add ( new Line ( y1 , y2 ) ) ; } Line x = new Line ( 1 , 2 ) ; Line y = new Line ( 1 , 1 ) ; Line prev = pq . poll ( ) ; while ( ! pq . isEmpty ( ) ) { Line cur = pq . poll ( ) ; if ( prev . y2 > cur . y2 ) { System . out . println ( " YES " ) ; return ; } prev = cur ; } System . out . println ( " NO " ) ; }
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