/*
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 */
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.util.*;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;

import static java.lang.Math.max;
import static java.lang.Math.min;
import static java.lang.Math.pow;
import static java.lang.Math.abs;

import static java.lang.String.format;


public class Main {
    final static int INF = Integer.MAX_VALUE>>1;
    final static int MOD = 1_000_000_007;
    final static int[] dx4 = { 0, 1, 0, -1 };
    final static int[] dy4 = { 1, 0, -1, 0 };
    final static int[] dx8 = {0, 1, 1,  1,  0, -1, -1, -1};
    final static int[] dy8 = {1, 1, 0, -1, -1, -1, 0, 1};
    public static void main(String[] args) {
        Scanner sc=new Scanner();
        int n=sc.nextInt();
        long[][] dp=new long[n+1][4*4*4];
        Arrays.fill(dp[3],1);
        for (int x = 0; x < 4 * 4 * 4; x++) {
            int keta0=(x>>4)&3;
            int keta1=(x>>2)&3;
            int keta2=(x>>0)&3;
            if(Moji.values()[keta0]==Moji.A&&Moji.values()[keta1]==Moji.G&&Moji.values()[keta2]==Moji.C)dp[3][x]=0;
            if(Moji.values()[keta0]==Moji.G&&Moji.values()[keta1]==Moji.A&&Moji.values()[keta2]==Moji.C)dp[3][x]=0;
            if(Moji.values()[keta0]==Moji.A&&Moji.values()[keta1]==Moji.C&&Moji.values()[keta2]==Moji.G)dp[3][x]=0;
        }
        for (int i = 4; i <= n; i++) {
            for (int x = 0; x < 4 * 4 * 4; x++) {
                int keta0=(x>>4)&3;
                int keta1=(x>>2)&3;
                int keta2=(x>>0)&3;
                for (Moji m : Moji.values()) {
                    if(Moji.values()[keta1]==Moji.A&&Moji.values()[keta2]==Moji.G&&m==Moji.C)continue;
                    if(Moji.values()[keta0]==Moji.A&&Moji.values()[keta2]==Moji.G&&m==Moji.C)continue;
                    if(Moji.values()[keta1]==Moji.G&&Moji.values()[keta2]==Moji.A&&m==Moji.C)continue;
                    if(Moji.values()[keta1]==Moji.A&&Moji.values()[keta2]==Moji.C&&m==Moji.G)continue;
                    if(Moji.values()[keta0]==Moji.A&&Moji.values()[keta1]==Moji.G&&m==Moji.C)continue;
                    dp[i][(keta1<<4)+(keta2<<2)+m.ordinal()]+=dp[i-1][x];
                    dp[i][(keta1<<4)+(keta2<<2)+m.ordinal()]%=MOD;
                }
            }
        }
        long ans=0;
        for(long anss:dp[n]){
            ans+=anss;
            ans%=MOD;
        }
        put(ans);

    }
    public static enum Moji{
        A,C,G,T;
    }
    public static class Permutation {
        public static int startIndexOfDescendingOrder(int[] p){
            //return i
            //mean p[i-1]<p[i]&&p[i]>p[i+1]>p[i+2]>...>p[p.length]
            for(int i=p.length-2;i>=0;i--){
                if(p[i]-p[i+1]>=0)continue;
                return i+1;
            }
            return 0;
        }
        public static <T> int startIndexOfDescendingOrder(T[] p,Comparator<? super T> comparator){
            //return i
            //mean p[i-1]<p[i]&&p[i]>p[i+1]>p[i+2]>...>p[p.length]
            for(int i=p.length-2;i>=0;i--){
                if(comparator.compare(p[i],p[i+1])>=0)continue;
                return i+1;
            }
            return 0;
        }
        public static <T> int startIndexOfDescendingOrder(List<T> list,Comparator<? super T> comparator){
            //return i
            //mean p[i-1]<p[i]&&p[i]>p[i+1]>p[i+2]>...>p[p.length]
            for(int i=list.size()-2;i>=0;i--){
                if(comparator.compare(list.get(i),list.get(i+1))>=0)continue;
                return i+1;
            }
            return 0;
        }

        public static boolean nextPermutation(int[] p) {
            int firstIndex=startIndexOfDescendingOrder(p);
            if(firstIndex==0)return false;
            int ng=p.length;
            int ok=firstIndex;
            firstIndex--;
            while(Math.abs(ng-ok)>1){
                int mid=(ng+ok)/2;
                if(p[mid]>p[firstIndex]){
                    ok=mid;
                }else{
                    ng=mid;
                }
            }
            int t = p[firstIndex];
            p[firstIndex] = p[ok];
            p[ok] = t;
            //p[firstIndex+1]以降のものを逆にする
            firstIndex++;
            Arrays.sort(p,firstIndex,p.length);
            return true;
        }
        public static <T> boolean nextPermutation(T[] p,Comparator<? super T> comparator){
            int firstIndex=startIndexOfDescendingOrder(p,comparator);
            if(firstIndex==0)return false;
            int ng=p.length;
            int ok=firstIndex;
            firstIndex--;
            while(Math.abs(ng-ok)>1){
                int mid=(ng+ok)/2;
                if(comparator.compare(p[mid],p[firstIndex])>0){
                    ok=mid;
                }else{
                    ng=mid;
                }
            }
            T t = p[firstIndex];
            p[firstIndex] = p[ok];
            p[ok] = t;
            //p[firstIndex+1]以降のものを逆にする
            //現在降順で昇順に並べる
            //ソートのほうが簡潔に書ける
            firstIndex++;
            Arrays.sort(p,firstIndex,p.length);
            return true;
        }
        public static <T> boolean nextPermutation(List<T> list,Comparator<T> comparator) {
            int firstIndex=startIndexOfDescendingOrder(list,comparator);
            if(firstIndex==0)return false;
            int ng=list.size();
            int ok=firstIndex;
            firstIndex--;
            //MGR式
            while(Math.abs(ng-ok)>1){
                int mid=(ng+ok)/2;
                if(comparator.compare(list.get(mid),list.get(firstIndex))>0){
                    //真に大きいならokの領域
                    ok=mid;
                }else{
                    ng=mid;
                }
            }
            T t = list.get(firstIndex);
            list.set(firstIndex,list.get(ok));
            list.set(ok,t);
            //インデックスがfirstIndex+1以降のものを逆にする
            firstIndex++;
            Collections.reverse(list.subList(firstIndex,list.size()));
            return true;
        }
        public static <T> boolean prevPermutation(List<T> list,Comparator<T> comparator){
            return nextPermutation(list,comparator.reversed());
        }
    }


    public static void print(Object object){
        System.out.print(object);
    }
    public static void put(Object object) {
        System.out.println(object);
    }
    public static void put(){
        System.out.println();
    }

    public static void printE(Object object){
        System.err.print("DEBUG:"+object);
    }
    public static void putE(Object object){
        System.err.println("DEBUG:"+object);
    }
    public static void putE(){
        System.err.println("DEBUG:");
    }

    public static void print(String format,Object... args){
        System.out.print(String.format(format,args));
    }
    public static void put(String format,Object... args) {
        System.out.println(String.format(format,args));
    }
    public static void printE(String format,Object... args){
        System.err.print("DEBUG:"+String.format(format,args));
    }
    public static void putE(String format,Object... args){
        System.err.println("DEBUG:"+String.format(format,args));
    }

    final static private class Scanner {
        private final InputStream in = System.in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;

        private boolean hasNextByte() {
            if (ptr < buflen) {
                return true;
            } else {
                ptr = 0;
                try {
                    buflen = in.read(buffer);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (buflen <= 0) {
                    return false;
                }
            }
            return true;
        }

        private int readByte() {
            if (hasNextByte())
                return buffer[ptr++];
            else
                return -1;
        }

        private boolean isPrintableChar(int c) {
            return 33 <= c && c <= 126;
        }

        public boolean hasNext() {
            while (hasNextByte() && !isPrintableChar(buffer[ptr]))
                ptr++;
            return hasNextByte();
        }

        public String next() {
            if (!hasNext())
                throw new NoSuchElementException();
            StringBuilder sb = new StringBuilder();
            int b = readByte();
            while (isPrintableChar(b)) {
                sb.appendCodePoint(b);
                b = readByte();
            }
            return sb.toString();
        }

        public long nextLong() {
            if (!hasNext())
                throw new NoSuchElementException();
            long n = 0;
            boolean minus = false;
            int b = readByte();
            if (b == '-') {
                minus = true;
                b = readByte();
            }
            if (b < '0' || '9' < b) {
                throw new NumberFormatException();
            }
            while (true) {
                if ('0' <= b && b <= '9') {
                    n *= 10;
                    n += b - '0';
                } else if (b == -1 || !isPrintableChar(b)) {
                    return minus ? -n : n;
                } else {
                    throw new NumberFormatException();
                }
                b = readByte();
            }
        }

        public int nextInt() {
            long nl = nextLong();
            if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
                throw new NumberFormatException();
            return (int) nl;
        }

        public double nextDouble() {
            return Double.parseDouble(next());
        }
    }
    final static private class FixedIntPair {
        final public int x, y;
        final static public FixedIntPair ZEROS=new FixedIntPair(0,0);
        FixedIntPair(int x, int y) {
            this.x = x;
            this.y = y;
        }
        public static double distance(FixedIntPair fip1,FixedIntPair fip2){
            double x = (double) fip1.x - fip2.x;
            double y = (double) fip1.y - fip2.y;
            return Math.sqrt(x*x+y*y);
        }

        @Override
        public int hashCode() {
            return x+y;
        }

        @Override
        public boolean equals(Object obj) {
            boolean result=super.equals(obj);
            if(obj.getClass()!=this.getClass()){
                return false;
            }
            FixedIntPair pair=(FixedIntPair) obj;
            if(this.x==pair.x&&this.y==pair.y) return true;
            return false;
        }

        @Override
        public String toString() {
            return String.format(FixedIntPair.class.getSimpleName()+":(%d,%d)", x, y);
        }
    }
    final static private class FixedLongPair {
        final public long x, y;
        final static public FixedLongPair ZEROS=new FixedLongPair(0,0);
        FixedLongPair(long x, long y) {
            this.x = x;
            this.y = y;
        }
        public static double distance(FixedLongPair flp1,FixedLongPair flp2){
            double x = (double) flp1.x - flp2.x;
            double y = (double) flp1.y - flp2.y;
            return Math.sqrt(x*x+y*y);
        }

        @Override
        public int hashCode() {
            return (int)x+(int)y;
        }

        @Override
        public boolean equals(Object obj) {
            boolean result=super.equals(obj);
            if(obj.getClass()!=this.getClass()){
                return false;
            }
            FixedLongPair pair=(FixedLongPair)obj;
            if(this.x==pair.x&&this.y==pair.y) return true;
            return false;
        }

        @Override
        public String toString() {
            return String.format(FixedLongPair.class.getSimpleName()+":(%d,%d)", x, y);
        }
    }
    final static private class Binary{
        public static String toZeroPadding(int i){
            return String.format("%"+Integer.toBinaryString(-1).length()+"s",Integer.toBinaryString(i)).replace(' ','0');
        }
        public static String toZeroPadding(long i){
            return String.format("%"+Long.toBinaryString(-1).length()+"s",Long.toBinaryString(i)).replace(' ','0');
        }
    }

    final static private class Util {
        static long gcd(long a,long b){
            //最大公約数　
            if(a%b==0)return b;
            return gcd(b,a%b);
        }
        static long lcm(long a,long b){
            //最小公倍数
            long gcd=gcd(a,b);
            long result=b/gcd;
            return a*result;
        }
        static <T extends Comparable<T>> Map<T,Integer> count(List<T> list){
            //副作用
            Collections.sort(list);
            Map<T,Integer> result=new HashMap<>();
            int l=0,r=0;
            while(l<list.size()){
                while(r<list.size()-1&&list.get(r).equals(r+1)){
                    r++;
                }
                result.put(list.get(r),r-l+1);
                r++;
                l=r;
            }
            return result;

        }
        static Map<Integer,Integer> count(int[] array){
            //副作用
            Arrays.sort(array);
            Map<Integer,Integer> result=new HashMap<>();
            int l=0,r=0;
            while(l<array.length){
                while(r<array.length-1&&array[r]==array[r+1]){
                    r++;
                }
                result.put(array[l],r-l+1);
                r++;
                l=r;
            }
            return result;
        }
        static <T> String toStringBWS(Iterable<T> iterable){
            Iterator<T> ite=iterable.iterator();
            return toStringBWS(ite);
        }
        static <T> String toStringBWS(Iterator<T> ite){
            StringBuilder sb=new StringBuilder();
            sb.append(ite.next());
            while(ite.hasNext()){
                sb.append(" ");
                sb.append(ite.next());
            }
            return sb.toString();
        }
        static long factoringInPrimeNumbers(long n,int[] a){
            //素因数分解
            for(int i=2;n>1&&i< a.length;i++){
                while(n%i==0){
                    a[i]++;
                    n/=i;
                }
            }
            return n;

        }
        static boolean isValidCell(int i,int j,int h,int w){
            return i>=0&&i<h&&j>=0&&j<w;
        }
    }
}


Measured memory_bytes: 25556