#pragma GCC optimize("O3")
//#pragma GCC target("avx")
#include <bits/stdc++.h>
using namespace std;
#define re return
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define make_unique(x) sort(all(x)),x.resize(unique(all(x))-x.begin())
#define fi first
#define se second
#define ss second.second
#define sf second.first
#define ff first.first
#define fs first.second
#define sqrt(x) sqrt(abs(x))
#define mp make_pair
#define PI 3.14159265358979323846
#define E 2.71828182845904523536
#define er erase
#define in insert
#define fo(i,n) for((i)=0;(i)<(n);(i)++)
#define ro(i,n) for((i)=n-1;(i)>=0;(i)--)
#define fr(i,j,n) for((i)=(j);(i)<(n);(i)++)
#define rf(i,j,n) for((i)=((n)-1);(i)>=(j);(i)--)
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int uint;
void eras(map<int,int> &m,int x)
{
    m[x]--;
    if (!m[x])
        m.erase(x);
}
const int N=(int)3e5+100;
const int M=(int)2e6+100;
const ll inf=(ll)1e18+100;
#define filename ""

int main()
{
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    //freopen(filename".in","r",stdin);
    //freopen(filename".out","w",stdout);
    //freopen("ans.txt","w",stdout);
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
    srand(time(0));
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int x;
    cin>>x;
    int i,j;
    ll ans=0;
    fr(i,1,x+1)
    {
        int y=x/i;
        for(j=1;j<=y;j++)
        {
            ans+=y/j;
        }
    }
    cout<<ans;
}

#include <cstring>
#include <cmath>
#include <algorithm>
#include <string>
#include <map>
#include <iostream>
#include <vector>
#include <queue>
#include <unordered_map>
#include <random>
#include <stack>
#include <set>
#include <list>
#include <unordered_set>

#define bug(x) cout<<"zdongdebug1: "<<x<<endl;
#define bug2(x, y) cout<<"zdongdebug2: "<<x<<" "<<y<<endl;
#define bug3(x, y, z) cout<<"zdongdebug3: "<<x<<" "<<y<<" "<<z<<endl;
using namespace std;
typedef long long ll;
void ex_gcd(ll a,ll b, ll& d,ll& x,ll& y){
  if(!b) {d=a;x=1;y=0;}
  else   {	ex_gcd(b,a%b,d,y,x);	y-=a/b*x;}
}
ll inv(ll a,ll n)  {
  ll d,x,y;	ex_gcd(a,n,d,x,y);
  return d==1?(x%n+n)%(n/d):-1;
}
ll gcd(ll x, ll y){
  if(y==0)return x;
  return gcd(y, x%y);
}
const int maxn = 105;
const int mod = 998244353;

int main() {
#ifdef suiyuan2009
  freopen("/Users/suiyuan2009/CLionProjects/icpc/input.txt", "r", stdin);
  //freopen("/Users/suiyuan2009/CLionProjects/icpc/output.txt", "w", stdout);
#endif
  int n;
  cin>>n;
  ll ret = 0;
  for(int i=1;i<=n;i++)
  for(int j=1;j<=n&&j*i<=n;j++){
    int tt = n/(i*j);
    ret+=tt;
  }
  cout<<ret<<endl;
  return 0;
}