use std::io::Read;
use std::collections::BTreeSet;

fn main() {

    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    let mut iter = buf.split_whitespace();
    
    let n: i32 = iter.next().unwrap().parse().unwrap();
    let mut ans = BTreeSet::new();
    for k in 1..(n+1){
        ans.insert(n / k);
    }
    println!("{}", ans.len());
    

}