use proconio::input;

const MOD: usize = 998_244_353;
fn main() {
    input! {
        n: usize,
    }

    let mut ans = 0;

    let mut dp = vec![0; n];
    dp[0] = 1;
    for i in 0..n {
        let mut swp = vec![0; n];
        for j in 0..n {
            if j == 0 {
                swp[1] += dp[0];
                if swp[1] >= MOD {
                    swp[1] -= MOD;
                }
            } else {
                swp[j - 1] += dp[j];
                if swp[j - 1] >= MOD {
                    swp[j - 1] -= MOD;
                }
                ans += dp[j] * (j - 1);
                if ans >= MOD {
                    ans -= MOD;
                }
                if n - j > i + 1 {
                    swp[j + 1] += dp[j];
                    if swp[j + 1] >= MOD {
                        swp[j + 1] -= MOD;
                    }
                }
            }
        }
        dp = swp;
    }

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