#[allow(unused_imports)]
use std::cmp::{max, min};
#[allow(unused_imports)]
use std::collections::{HashMap, HashSet};

mod util {
    use std::io::stdin;
    use std::str::FromStr;
    use std::fmt::Debug;

    #[allow(dead_code)]
    pub fn line() -> String {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        line.trim().to_string()
    }

    #[allow(dead_code)]
    pub fn get<T: FromStr>() -> T
    where
        <T as FromStr>::Err: Debug,
    {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        line.trim().parse().unwrap()
    }

    #[allow(dead_code)]
    pub fn gets<T: FromStr>() -> Vec<T>
    where
        <T as FromStr>::Err: Debug,
    {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        line.split_whitespace()
            .map(|t| t.parse().unwrap())
            .collect()
    }

    #[allow(dead_code)]
    pub fn get2<T: FromStr, U: FromStr>() -> (T, U)
    where
        <T as FromStr>::Err: Debug,
        <U as FromStr>::Err: Debug,
    {
        let mut line: String = String::new();
        stdin().read_line(&mut line).unwrap();
        let mut iter = line.split_whitespace();
        (
            iter.next().unwrap().parse().unwrap(),
            iter.next().unwrap().parse().unwrap(),
        )
    }
}


#[allow(unused_macros)]
macro_rules! debug {
    ($x: expr) => {
        println!("{}: {:?}", stringify!($x), $x)
    }
}

const M: usize = 1000000007;

fn main() {
    let n: usize = util::get();

    let mut dp = vec![vec![0; 3]; max(n + 1, 4)];
    dp[1][0] = 1;
    dp[2][1] = 1;
    dp[3][2] = 1;

    for i in 1..n + 1 {
        if i >= 1 {
            dp[i][0] = (dp[i][0] + dp[i - 1][1]) % M;
            dp[i][0] = (dp[i][0] + dp[i - 1][2]) % M;
        }
        if i >= 2 {
            dp[i][1] = (dp[i][1] + dp[i - 2][0]) % M;
            dp[i][1] = (dp[i][1] + dp[i - 2][2]) % M;
        }
        if i >= 3 {
            dp[i][2] = (dp[i][2] + dp[i - 3][0]) % M;
            dp[i][2] = (dp[i][2] + dp[i - 3][1]) % M;
        }
    }
    println!("{}", dp[n].iter().fold(0, |a, &b| (a + b) % M));
}