use std::collections::HashSet;

fn main() {
    let n = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        line.trim().parse::<String>().unwrap()
    };

    let mut ans = 0;
    let mut used = HashSet::new();
    for i in 0..=n.len() {
        for ins in '0'..='9' {
            if i == 0 && ins == '0' {
                continue;
            }

            let mut inserted = n.clone();
            inserted.insert(i, ins);

            if !used.contains(&inserted) {
                used.insert(inserted);
                ans += 1;

                continue;
            }
        }
    }

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