use std::io::stdin;

fn main(){
    let n: usize = getvec()[0];
    println!("{}", solve(n));
}

fn solve(n: usize) -> usize {
    let mut dp: Vec<Vec<_>> = Vec::new();
    dp.push(vec![1, 1, 1]);
    dp.push(vec![1, 0, 0]);
    dp.push(vec![0, 1, 0]);
    dp.push(vec![0, 0, 1]);
    for i in 1..n {
        dp[i+1][0] = (dp[i+1][0]+dp[i][1]+dp[i][2]) % 1000000007;
        dp[i+2][1] = (dp[i+2][1]+dp[i][0]+dp[i][2]) % 1000000007;
        let x = (dp[i][0]+dp[i][1]) % 1000000007;
        dp.push(vec![0, 0, x]);
    }
    dp[n].iter().fold(0, |acc, x| acc+x) % 1000000007
}

#[allow(dead_code)]
fn getline() -> String {
    let mut s = String::new();
    match stdin().read_line(&mut s){
        Ok(_) => {s.trim().to_string()}
        Err(_) => String::new()
    }
}

#[allow(dead_code)]
fn getvec<T: std::str::FromStr>() -> Vec<T>{
    let line = getline();
    line.split_whitespace().filter_map(|x| x.parse().ok()).collect()
}

#[allow(dead_code)]
fn getpair() -> (usize, usize){
    let nm = getvec();
    (nm[0], nm[1])
}