use proconio::input;
fn main() {
    input!{
        n: usize,
    }
    let x = (n - 9) / 10;
    let mut l = x.to_string().len();
    let mut m = 0;
    for i in 0..{
        m += 10usize.pow(l as u32 * i + 1);
        if x * m > 10usize.pow(9){
            break;
        }
    }
    let mut ans: usize = x * m + 9;
    println!("{}", ans)
}