import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static int[][] dp;
    static final int MOD = 1000000007;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        dp = new int[3][n];
        int ans = 0;
        for (int i = 0; i < 3; i++) {
            ans += dfw(i, n - i - 1);
            ans %= MOD;
        }
        System.out.println(ans);
    }
    
    static int dfw(int idx, int value) {
        if (value < 0) {
            return 0;
        }
        if (value == 0) {
            return 1;
        }
        if (dp[idx][value] == 0) {
            for (int i = 0; i < 3; i++) {
                if (i == idx) {
                    continue;
                }
                dp[idx][value] += dfw(i, value - i - 1);
                dp[idx][value] %= MOD;
            }
        }
        return dp[idx][value];
    }
}

class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}