use std::io::*;
const MOD: u64 = 1_000_000_007;

fn inv(mut x: u64) -> u64 {
    let mut res = 1;
    let mut e = MOD - 2;
    while e > 0 {
        if e & 1 == 1 {
            res = res * x % MOD;
        }
        x = x * x % MOD;
        e >>= 1;
    }
    res
}

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: u64 = itr.next().unwrap().parse().unwrap();

    let mut ans = 1;
    let mut two = 1;
    for i in 1..(n << 1) + 1 {
        ans = ans * i % MOD;
    }
    for _ in 0..n {
        two = two * 2 % MOD;
    }
    ans = ans * inv(two) % MOD;
    println!("{}", ans);
}