public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int k = sc . nextInt ( ) ;
  int ans = 0 ;
  ans = ans + ( n + 1 ) ;
  ans = ans + n ;
  if ( k == 1 || k == n ) ans = ans + ( n - 1 ) ;
  else {
    int a1 = Math . abs ( n - k ) ;
    int a2 = ( k - 1 ) ;
    int x = Math . min ( a1 , a2 ) ;
    ans += ( x * 2 ) ;
    ans = ans + Math . max ( a1 , a2 ) ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; int ans = 0 ; ans = ans + ( n + 1 ) ; ans = ans + n ; if ( k == 1 || k == n ) ans = ans + ( n - 1 ) ; else { int a1 = Math . abs ( n - k ) ; int a2 = ( k - 1 ) ; int x = Math . min ( a1 , a2 ) ; ans += ( x * 2 ) ; ans = ans + Math . max ( a1 , a2 ) ; } System . out . println ( ans ) ; }
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