#include <iostream>
#include <fstream>
#include <map>
using namespace std;

main() {
    ifstream cin("fractii.in");
    ofstream cout("fractii.out");
    int n;
    cin>>n;
    map<double, bool> a;
    for (int i = 1; i <=n; i++) {
        for (int j = i; j <=n; j++) {
            a[i*1.0/j] = true;
            a[j*1.0/i] = true;
        }
    }
    cout<<a.size();
}