/*
URL:
https://atcoder.jp/contests/abc122/tasks/abc122_d
*/

package main

import (
	"bufio"
	"errors"
	"fmt"
	"io"
	"math"
	"os"
	"strconv"
)

/********** FAU standard libraries **********/

//fmt.Sprintf("%b\n", 255) 	// binary expression

/********** I/O usage **********/

//str := ReadString()
//i := ReadInt()
//X := ReadIntSlice(n)
//S := ReadRuneSlice()
//a := ReadFloat64()
//A := ReadFloat64Slice(n)

//str := ZeroPaddingRuneSlice(num, 32)
//str := PrintIntsLine(X...)

/*******************************************************************/

const (
	// General purpose
	MOD          = 1000000000 + 7
	ALPHABET_NUM = 26
	INF_INT64    = math.MaxInt64
	INF_BIT60    = 1 << 60
	INF_INT32    = math.MaxInt32
	INF_BIT30    = 1 << 30
	NIL          = -1

	// for dijkstra, prim, and so on
	WHITE = 0
	GRAY  = 1
	BLACK = 2
)

func init() {
	// bufio.ScanWords <---> bufio.ScanLines
	ReadString = newReadString(os.Stdin, bufio.ScanWords)
	stdout = bufio.NewWriter(os.Stdout)
}

var (
	n int

	dp [100 + 5][10][10][10]int
)

const (
	A = 1
	G = 2
	C = 3
	T = 4
)

func main() {
	n = ReadInt()

	// dp[0][0][0][0] = 1
	for j := 1; j <= 4; j++ {
		for k := 1; k <= 4; k++ {
			for l := 1; l <= 4; l++ {
				// AGC, ACG, GAC
				a := j == C && k == G && l == A
				b := j == G && k == C && l == A
				c := j == C && k == A && l == G
				if !(a || b || c) {
					dp[3][j][k][l] = 1
				}
			}
		}
	}

	for i := 3; i < n; i++ {
		for j := 1; j <= 4; j++ {
			for k := 1; k <= 4; k++ {
				for l := 1; l <= 4; l++ {
					// if l > 0 && (k == 0 || j == 0) {
					// 	continue
					// }
					// if k > 0 && j == 0 {
					// 	continue
					// }

					// mは次の文字
					for m := 1; m <= 4; m++ {
						a := !(j == G && k == A && m == C)
						b := !(j == C && k == A && m == G)
						c := !(j == A && k == G && m == C)
						d := !(k == G && l == A && m == C)
						e := !(j == G && l == A && m == C)
						if a && b && c && d && e {
							dp[i+1][m][j][k] += dp[i][j][k][l]
							dp[i+1][m][j][k] %= MOD
						}

						// // AGX
						// if !(j == G && k == A && m == C) {
						// 	dp[i+1][m][j][k] += dp[i][j][k][l]
						// 	dp[i+1][m][j][k] %= MOD
						// }
						// // ACX
						// if !(j == C && k == A && m == G) {
						// 	dp[i+1][m][j][k] += dp[i][j][k][l]
						// 	dp[i+1][m][j][k] %= MOD
						// }
						// // GAX
						// if !(j == A && k == G && m == C) {
						// 	dp[i+1][m][j][k] += dp[i][j][k][l]
						// 	dp[i+1][m][j][k] %= MOD
						// }
						// // AGXX
						// if !(k == G && l == A && m == C) {
						// 	dp[i+1][m][j][k] += dp[i][j][k][l]
						// 	dp[i+1][m][j][k] %= MOD
						// }
					}
				}
			}
		}
	}

	ans := 0
	for j := 1; j <= 4; j++ {
		for k := 1; k <= 4; k++ {
			for l := 1; l <= 4; l++ {
				// AGC, ACG, GAC
				// a := j == C && k == G && l == A
				// b := j == G && k == C && l == A
				// c := j == C && k == A && l == G
				// if !(a || b || c) {
				ans += dp[n][j][k][l]
				ans %= MOD
				// }
			}
		}
	}
	fmt.Println(ans)
}

/*******************************************************************/

/*********** I/O ***********/

var (
	// ReadString returns a WORD string.
	ReadString func() string
	stdout     *bufio.Writer
)

func newReadString(ior io.Reader, sf bufio.SplitFunc) func() string {
	r := bufio.NewScanner(ior)
	r.Buffer(make([]byte, 1024), int(1e+9)) // for Codeforces
	r.Split(sf)

	return func() string {
		if !r.Scan() {
			panic("Scan failed")
		}
		return r.Text()
	}
}

// ReadInt returns an integer.
func ReadInt() int {
	return int(readInt64())
}
func ReadInt2() (int, int) {
	return int(readInt64()), int(readInt64())
}
func ReadInt3() (int, int, int) {
	return int(readInt64()), int(readInt64()), int(readInt64())
}
func ReadInt4() (int, int, int, int) {
	return int(readInt64()), int(readInt64()), int(readInt64()), int(readInt64())
}

// ReadInt64 returns as integer as int64.
func ReadInt64() int64 {
	return readInt64()
}
func ReadInt64_2() (int64, int64) {
	return readInt64(), readInt64()
}
func ReadInt64_3() (int64, int64, int64) {
	return readInt64(), readInt64(), readInt64()
}
func ReadInt64_4() (int64, int64, int64, int64) {
	return readInt64(), readInt64(), readInt64(), readInt64()
}

func readInt64() int64 {
	i, err := strconv.ParseInt(ReadString(), 0, 64)
	if err != nil {
		panic(err.Error())
	}
	return i
}

// ReadIntSlice returns an integer slice that has n integers.
func ReadIntSlice(n int) []int {
	b := make([]int, n)
	for i := 0; i < n; i++ {
		b[i] = ReadInt()
	}
	return b
}

// ReadInt64Slice returns as int64 slice that has n integers.
func ReadInt64Slice(n int) []int64 {
	b := make([]int64, n)
	for i := 0; i < n; i++ {
		b[i] = ReadInt64()
	}
	return b
}

// ReadFloat64 returns an float64.
func ReadFloat64() float64 {
	return float64(readFloat64())
}

func readFloat64() float64 {
	f, err := strconv.ParseFloat(ReadString(), 64)
	if err != nil {
		panic(err.Error())
	}
	return f
}

// ReadFloatSlice returns an float64 slice that has n float64.
func ReadFloat64Slice(n int) []float64 {
	b := make([]float64, n)
	for i := 0; i < n; i++ {
		b[i] = ReadFloat64()
	}
	return b
}

// ReadRuneSlice returns a rune slice.
func ReadRuneSlice() []rune {
	return []rune(ReadString())
}

/*********** Debugging ***********/

// ZeroPaddingRuneSlice returns binary expressions of integer n with zero padding.
// For debugging use.
func ZeroPaddingRuneSlice(n, digitsNum int) []rune {
	sn := fmt.Sprintf("%b", n)

	residualLength := digitsNum - len(sn)
	if residualLength <= 0 {
		return []rune(sn)
	}

	zeros := make([]rune, residualLength)
	for i := 0; i < len(zeros); i++ {
		zeros[i] = '0'
	}

	res := []rune{}
	res = append(res, zeros...)
	res = append(res, []rune(sn)...)

	return res
}

// Strtoi is a wrapper of strconv.Atoi().
// If strconv.Atoi() returns an error, Strtoi calls panic.
func Strtoi(s string) int {
	if i, err := strconv.Atoi(s); err != nil {
		panic(errors.New("[argument error]: Strtoi only accepts integer string"))
	} else {
		return i
	}
}

// PrintIntsLine returns integers string delimited by a space.
func PrintIntsLine(A ...int) string {
	res := []rune{}

	for i := 0; i < len(A); i++ {
		str := strconv.Itoa(A[i])
		res = append(res, []rune(str)...)

		if i != len(A)-1 {
			res = append(res, ' ')
		}
	}

	return string(res)
}

// PrintIntsLine returns integers string delimited by a space.
func PrintInts64Line(A ...int64) string {
	res := []rune{}

	for i := 0; i < len(A); i++ {
		str := strconv.FormatInt(A[i], 10) // 64bit int version
		res = append(res, []rune(str)...)

		if i != len(A)-1 {
			res = append(res, ' ')
		}
	}

	return string(res)
}

// PrintfDebug is wrapper of fmt.Fprintf(os.Stderr, format, a...)
func PrintfDebug(format string, a ...interface{}) {
	fmt.Fprintf(os.Stderr, format, a...)
}

// PrintfBufStdout is function for output strings to buffered os.Stdout.
// You may have to call stdout.Flush() finally.
func PrintfBufStdout(format string, a ...interface{}) {
	fmt.Fprintf(stdout, format, a...)
}


Measured memory_bytes: 1280