#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;

main() {
    ifstream cin("fractii.in");
    ofstream cout("fractii.out");
    int n;
    cin>>n;
    vector<double> a;
    for (int i = 1; i <=n; i++) {
        for (int j = i; j <=n; j++) {
            a.push_back(i*1.0/j);
            a.push_back(j*1.0/i);
        }
    }
    sort(a.begin(), a.end());
    int k = 1;
    for (int i = 1; i < a.size(); i++) {
        if (a[i] != a[i-1]) {
            k++;
        }
    }
    cout<<k;
}