public static void main ( String [ ] args ) {
  FastReader in = new FastReader ( ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  int n = in . nextInt ( ) ;
  int MOD = ( int ) ( 1e9 + 7 ) ;
  long ans = 1 ;
  long diff = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    ans = ans * 27 ;
    diff = diff * 7 ;
    ans = ( ans ) % MOD ;
    diff = ( diff ) % MOD ;
  }
  ans = ans - diff ;
  if ( ans < 0 ) ans += MOD ;
  out . println ( ans ) ;
  out . close ( ) ;
}

public static void main ( String [ ] args ) { FastReader in = new FastReader ( ) ; PrintWriter out = new PrintWriter ( System . out ) ; int n = in . nextInt ( ) ; int MOD = ( int ) ( 1e9 + 7 ) ; long ans = 1 ; long diff = 1 ; for ( int i = 0 ; i < n ; i ++ ) { ans = ans * 27 ; diff = diff * 7 ; ans = ( ans ) % MOD ; diff = ( diff ) % MOD ; } ans = ans - diff ; if ( ans < 0 ) ans += MOD ; out . println ( ans ) ; out . close ( ) ; }
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