#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;

int main(){
    i64 N; cin >> N;
    if(N == 1){ cout << "0\n"; return 0; }
    i64 ans = 0;
    for(i64 a=0; a<=9; a++) for(i64 b=0; b<=9; b++) if(a != b){
        i64 pmin = max({ (i64)2, a+1, b+1 });
        i64 pl = pmin-1, pr = 1'000'000'000;
        while(pl + 1 < pr){
            i64 pm = (pl + pr) / 2;
            if(N * (a * pm + b) > pm * pm - 1) pl = pm; else pr = pm;
        }
        ans += pr - pmin;
    }
    cout << ans << endl;
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;