#include <bits/stdc++.h>

#define eps 1e-8
#define PI 3.141592653589793
#define bsize 512

#define ll long long
#define ull unsigned long long
#define pii pair<int,int>
#define vi vector<int>
#define vii vector<vector<int>>
#define pb push_back
#define bs 1000000007

using namespace std;

ll int fact(ll int a){
    ll int fact=1;
    for(int i=2;i<=a;i++){
        fact*=i;
    }
    return fact;
}

int main()
{
    
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif

    ll int l,ans=1;
    cin>>l;
 
    for(int i = 1; i <= 11; i++) {
        ans *= (l-1) - 11 + i;
        ans /= i;
    }
 
    cout << ans;
   


    
    return 0;
}
#include<bits/stdc++.h>
using namespace std;
using lint = long long;
using P = pair<lint, lint>;
const int mod = 1000000007;
#define all(a) (a).begin(),(a).end()
#define rep(i, n) for (lint i = 0; i < (lint)(n); i++)
inline lint fcl(lint num){
    return (num == 1 ? 1 : (num * fcl(num - 1)));
}
int main(){
    lint k;
    lint a, b, c;
    cin >> k;
    lint ans = 0;
    for(lint i = 1; i <= k; i++){
        for(lint j = 1; i * j <= k; j++){
            ans += k / (i * j);
        }
    }
    cout << ans << endl;
}