public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int k = sc . nextInt ( ) ;
  int l = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  int n = sc . nextInt ( ) ;
  int d = sc . nextInt ( ) ;
  int count = 0 ;
  boolean dragons [ ] = new boolean [ d + 1 ] ;
  for ( int i = 1 ;
  i < d + 1 ;
  i ++ ) {
    if ( i % k == 0 ) {
      dragons [ i ] = true ;
    }
  }
  for ( int i = 1 ;
  i < d + 1 ;
  i ++ ) {
    if ( i % l == 0 ) {
      dragons [ i ] = true ;
    }
  }
  for ( int i = 1 ;
  i < d + 1 ;
  i ++ ) {
    if ( i % m == 0 ) {
      dragons [ i ] = true ;
    }
  }
  for ( int i = 1 ;
  i < d + 1 ;
  i ++ ) {
    if ( i % n == 0 ) {
      dragons [ i ] = true ;
    }
  }
  for ( int i = 1 ;
  i < d + 1 ;
  i ++ ) {
    if ( dragons [ i ] == true ) {
      count ++ ;
    }
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int k = sc . nextInt ( ) ; int l = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; int n = sc . nextInt ( ) ; int d = sc . nextInt ( ) ; int count = 0 ; boolean dragons [ ] = new boolean [ d + 1 ] ; for ( int i = 1 ; i < d + 1 ; i ++ ) { if ( i % k == 0 ) { dragons [ i ] = true ; } } for ( int i = 1 ; i < d + 1 ; i ++ ) { if ( i % l == 0 ) { dragons [ i ] = true ; } } for ( int i = 1 ; i < d + 1 ; i ++ ) { if ( i % m == 0 ) { dragons [ i ] = true ; } } for ( int i = 1 ; i < d + 1 ; i ++ ) { if ( i % n == 0 ) { dragons [ i ] = true ; } } for ( int i = 1 ; i < d + 1 ; i ++ ) { if ( dragons [ i ] == true ) { count ++ ; } } System . out . println ( count ) ; }
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