public static void main ( String [ ] args ) throws IOException {
  BufferedReader in = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringBuilder out = new StringBuilder ( ) ;
  StringTokenizer tk ;
  int oldN = 0 ;
  int n = Integer . parseInt ( in . readLine ( ) ) ;
  long minTime = 2 * n - 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int h = Integer . parseInt ( in . readLine ( ) ) ;
    minTime += Math . abs ( oldN - h ) ;
    oldN = h ;
  }
  System . out . println ( minTime ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader in = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringBuilder out = new StringBuilder ( ) ; StringTokenizer tk ; int oldN = 0 ; int n = Integer . parseInt ( in . readLine ( ) ) ; long minTime = 2 * n - 1 ; for ( int i = 0 ; i < n ; i ++ ) { int h = Integer . parseInt ( in . readLine ( ) ) ; minTime += Math . abs ( oldN - h ) ; oldN = h ; } System . out . println ( minTime ) ; }
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