public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n = input . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  int [ ] b = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = input . nextInt ( ) ;
    b [ i ] = input . nextInt ( ) ;
  }
  divisor ( a [ 0 ] ) ;
  divisor ( b [ 0 ] ) ;
  int count = 0 ;
  for ( int m : set ) {
    boolean bool = true ;
    for ( int i = 1 ;
    i < n ;
    i ++ ) {
      if ( a [ i ] % m != 0 && b [ i ] % m != 0 ) {
        bool = false ;
        break ;
      }
    }
    if ( bool ) {
      System . out . println ( m ) ;
      return ;
    }
  }
  System . out . println ( - 1 ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n = input . nextInt ( ) ; int [ ] a = new int [ n ] ; int [ ] b = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = input . nextInt ( ) ; b [ i ] = input . nextInt ( ) ; } divisor ( a [ 0 ] ) ; divisor ( b [ 0 ] ) ; int count = 0 ; for ( int m : set ) { boolean bool = true ; for ( int i = 1 ; i < n ; i ++ ) { if ( a [ i ] % m != 0 && b [ i ] % m != 0 ) { bool = false ; break ; } } if ( bool ) { System . out . println ( m ) ; return ; } } System . out . println ( - 1 ) ; }
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