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

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int[][][] dp = new int[n + 1][2][2];
        dp[0][0][1] = 1;
        for (int i = 1; i <= n; i++) {
            for (int j = 0; j < 2; j++) {
                for (int k = 0; k < 2; k++) {
                    if (k == 1) {
                        dp[i][k][0] += dp[i - 1][j][k];
                        dp[i][k][0] %= MOD;
                    } else if (j == 0 && k == 0) {
                        dp[i][k][1] += dp[i - 1][j][k];
                        dp[i][k][1] %= MOD;
                    } else {
                        dp[i][k][0] += dp[i - 1][j][k];
                        dp[i][k][0] %= MOD;
                        dp[i][k][1] += dp[i - 1][j][k];
                        dp[i][k][1] %= MOD;
                    }
                }
            }
        }
        int ans = 0;
        for (int i = 0; i < 2; i++) {
            for (int j = 0; j < 2; j++) {
                ans += dp[n][i][j];
                ans %= MOD;
            }
        }
        System.out.println(ans);
    }
}
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 String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}