public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int a = sc . nextInt ( ) ;
  int b = sc . nextInt ( ) ;
  int c = sc . nextInt ( ) ;
  b /= 2 ;
  c /= 4 ;
  int res = 7 * ( Integer . min ( Integer . min ( a , b ) , Integer . min ( b , c ) ) ) ;
  System . out . println ( res ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int c = sc . nextInt ( ) ; b /= 2 ; c /= 4 ; int res = 7 * ( Integer . min ( Integer . min ( a , b ) , Integer . min ( b , c ) ) ) ; System . out . println ( res ) ; }
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