#![allow(non_snake_case)]

use std::io::{ self, prelude::* };

macro_rules! pick {
    ($tokens:expr) => {
        $tokens.next().unwrap().parse().expect("parse error")
    }
}

struct Solver {
    memo: Vec<Option<i64>>,
}

impl Solver {
    const MOD: i64 = 1_000_000_007;

    fn new() -> Self {
        let mut memo = vec![None; 100001];
        memo[1] = Some(1);
        memo[2] = Some(2);
        memo[3] = Some(6);

        Self {
            memo,
        }
    }

    fn f(&mut self, n: i64) -> i64 {
        if let Some(res) = self.memo[n as usize] { return res; }

        let mut res = 0;
        res += n*self.f(n-2) / (n-2);
        res %= Solver::MOD;
        res += n*self.f(n-1);
        res %= Solver::MOD;
        self.memo[n as usize] = Some(res);
        res
    }
}

fn main() {
    let mut s = String::new();
    io::stdin().read_to_string(&mut s).expect("i/o error");
    let mut tokens = s.split_whitespace();

    let N: i64 = pick!(tokens);

    let mut solver = Solver::new();
    let ans = solver.f(N);

    println!("{}", ans);
}