public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int x = scanner . nextInt ( ) ;
  int y = scanner . nextInt ( ) ;
  int a = scanner . nextInt ( ) ;
  int b = scanner . nextInt ( ) ;
  int comm = lcm ( x , y ) ;
  long ans = ( ( b - b % comm ) - ( a - a % comm ) ) / comm ;
  if ( a % comm == 0 ) ans ++ ;
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int x = scanner . nextInt ( ) ; int y = scanner . nextInt ( ) ; int a = scanner . nextInt ( ) ; int b = scanner . nextInt ( ) ; int comm = lcm ( x , y ) ; long ans = ( ( b - b % comm ) - ( a - a % comm ) ) / comm ; if ( a % comm == 0 ) ans ++ ; System . out . println ( ans ) ; }
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