public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n = input . nextInt ( ) ;
  BigInteger a = new BigInteger ( "3" ) . pow ( 3 * n ) ;
  a = a . subtract ( new BigInteger ( "7" ) . pow ( n ) ) ;
  System . out . println ( a . mod ( new BigInteger ( "1000000007" ) ) ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n = input . nextInt ( ) ; BigInteger a = new BigInteger ( "3" ) . pow ( 3 * n ) ; a = a . subtract ( new BigInteger ( "7" ) . pow ( n ) ) ; System . out . println ( a . mod ( new BigInteger ( "1000000007" ) ) ) ; }
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