use std::collections::HashSet;

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();

    let mut result: HashSet<usize> = HashSet::new();
    for i in 1..=n {
        result.insert(n / i);
    }
    println!("{}", result.len());
}