public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  long answer = 0 ;
  long [ ] [ ] dp = new long [ n + 1 ] [ 4 ] ;
  dp [ 1 ] = new long [ ] {
    1 , 1 , 1 , 1 };
    dp [ 2 ] = new long [ ] {
      4 , 4 , 4 , 4 };
      dp [ 3 ] = new long [ ] {
        16 , 14 , 15 , 16 };
        if ( n >= 4 ) {
          for ( int i = 4 ;
          i <= n ;
          i ++ ) {
            long sum = 0 ;
            for ( int j = 0 ;
            j < 4 ;
            j ++ ) {
              sum += dp [ i - 1 ] [ j ] ;
            }
            sum %= 1000000007 ;
            dp [ i ] [ 0 ] = sum ;
            dp [ i ] [ 3 ] = sum ;
            dp [ i ] [ 1 ] = sum - dp [ i - 2 ] [ 0 ] - dp [ i - 2 ] [ 2 ] - dp [ i - 3 ] [ 0 ] * 3 ;
            dp [ i ] [ 2 ] = sum - dp [ i - 2 ] [ 0 ] + dp [ i - 3 ] [ 2 ] ;
            sum = 0 ;
          }
        }
        for ( int j = 0 ;
        j < 4 ;
        j ++ ) {
          answer += dp [ n ] [ j ] ;
        }
        answer %= 1000000007 ;
        System . out . println ( answer ) ;
      }
      
public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; long answer = 0 ; long [ ] [ ] dp = new long [ n + 1 ] [ 4 ] ; dp [ 1 ] = new long [ ] { 1 , 1 , 1 , 1 } ; dp [ 2 ] = new long [ ] { 4 , 4 , 4 , 4 } ; dp [ 3 ] = new long [ ] { 16 , 14 , 15 , 16 } ; if ( n >= 4 ) { for ( int i = 4 ; i <= n ; i ++ ) { long sum = 0 ; for ( int j = 0 ; j < 4 ; j ++ ) { sum += dp [ i - 1 ] [ j ] ; } sum %= 1000000007 ; dp [ i ] [ 0 ] = sum ; dp [ i ] [ 3 ] = sum ; dp [ i ] [ 1 ] = sum - dp [ i - 2 ] [ 0 ] - dp [ i - 2 ] [ 2 ] - dp [ i - 3 ] [ 0 ] * 3 ; dp [ i ] [ 2 ] = sum - dp [ i - 2 ] [ 0 ] + dp [ i - 3 ] [ 2 ] ; sum = 0 ; } } for ( int j = 0 ; j < 4 ; j ++ ) { answer += dp [ n ] [ j ] ; } answer %= 1000000007 ; System . out . println ( answer ) ; }
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