// (a/p + b/p^2) * p^2/(p^2 - 1) > 1/N
// (ap + b) / (p^2 - 1) > 1/N
// (ap + b) * N > p^2 - 1

fn main() {
    input!(n: usize);
    let mut ans = 0;
    for a in 0..10 {
        for b in 0..10 {
            if a == b {
                continue;
            }
            let can = |p: usize| (p * p  - 1) < n * (p * a + b);
            let u = 1000000000;
            let d = a.max(b) + 1;
            if !can(d) {
                continue;
            }
            let mut ng = u;
            let mut ok = d;
            while ng - ok > 1 {
                let mid = (ok + ng) / 2;
                if can(mid) {
                    ok = mid;
                } else {
                    ng = mid;
                }
            }
            ans += ok - d + 1;
        }
    }
    println!("{}", ans);
}

// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------