import java.util.*;
import java.io.*;
 
public class Main {
    public static void main(String[] args) throws Exception {
        FastScanner sc = new FastScanner(System.in);
        PrintWriter pw = new PrintWriter(System.out);
        int n = sc.nextInt();
        int[][][][] dp = new int[n+1][4][4][4];
        int mod = (int) 1e9+7;
        dp[0][3][3][3] = 1;
        for(int i = 0; i < n; i++){
            for(int j = 0; j < 4; j++){
                for(int k = 0; k < 4; k++){
                    for(int l = 0; l < 4; l++){
                        if(dp[i][j][k][l] == 0) continue;
                        for(int a = 0; a < 4; a++){
                            if(a == 2 && j == 1 && k == 0) continue;
                            if(a == 2 && j == 0 && k == 1) continue;
                            if(a == 1 && j == 2 && k == 0) continue;
                            if(a == 2 && j == 1 && l == 0) continue;
                            if(a == 2 && k == 1 && l == 0) continue;
                            
                            dp[i+1][a][j][k] += dp[i][j][k][l];
                            dp[i+1][a][j][k] %= mod;
                        }
                    }
                }
            }
        }
        int ans = 0;
        for(int j = 0; j < 4; j++){
            for(int k = 0; k < 4; k++){
                for(int l = 0; l < 4; l++){
                    ans += dp[n][j][k][l];
                    ans %= mod;
                }
            }
        }
        pw.println(ans);
        pw.flush();
    }

    static class GeekInteger {
        public static void save_sort(int[] array) {
            shuffle(array);
            Arrays.sort(array);
        }
 
        public static int[] shuffle(int[] array) {
            int n = array.length;
            Random random = new Random();
            for (int i = 0, j; i < n; i++) {
                j = i + random.nextInt(n - i);
                int randomElement = array[j];
                array[j] = array[i];
                array[i] = randomElement;
            }
            return array;
        }
 
    }
}

class FastScanner {
    private BufferedReader reader = null;
    private StringTokenizer tokenizer = null;
    public FastScanner(InputStream in) {
        reader = new BufferedReader(new InputStreamReader(in));
        tokenizer = null;
    }

    public String next() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }

    public String nextLine() {
        if (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                return reader.readLine();
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken("\n");
    }

    public long nextLong() {
        return Long.parseLong(next());
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }

    public double nextDouble() {
         return Double.parseDouble(next());
    }
    
    public String[] nextArray(int n) {
        String[] a = new String[n];
        for (int i = 0; i < n; i++)
            a[i] = next();
        return a;
    }

    public int[] nextIntArray(int n) {
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = nextInt();
        return a;
    }

    public long[] nextLongArray(int n) {
        long[] a = new long[n];
        for (int i = 0; i < n; i++)
            a[i] = nextLong();
        return a;
    } 
}


Measured memory_bytes: 25492