public static void main ( String [ ] args ) {
  int a = 2 , b = 5 , c = 8 , cont = 0 ;
  Scanner in = new Scanner ( System . in ) ;
  int n , k , com ;
  n = in . nextInt ( ) ;
  k = in . nextInt ( ) ;
  a *= n ;
  b *= n ;
  c *= n ;
  com = 0 ;
  while ( com < a ) {
    com += k ;
    cont ++ ;
  }
  com = 0 ;
  while ( com < b ) {
    com += k ;
    cont ++ ;
  }
  com = 0 ;
  while ( com < c ) {
    com += k ;
    cont ++ ;
  }
  System . out . print ( cont ) ;
}

public static void main ( String [ ] args ) { int a = 2 , b = 5 , c = 8 , cont = 0 ; Scanner in = new Scanner ( System . in ) ; int n , k , com ; n = in . nextInt ( ) ; k = in . nextInt ( ) ; a *= n ; b *= n ; c *= n ; com = 0 ; while ( com < a ) { com += k ; cont ++ ; } com = 0 ; while ( com < b ) { com += k ; cont ++ ; } com = 0 ; while ( com < c ) { com += k ; cont ++ ; } System . out . print ( cont ) ; }
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