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

ifstream f("fractii.in");
ofstream o("fractii.out");

main()
{
    vector<double> t;
    int n,k=1;
    double m;
    t.push_back(1);
    f>>n;
    for (int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            m=(1.0*i/j);
            bool b=false;
            for(int l=0;l<k;l++)
            {
                if (t[l]==m){b=true; continue;}
            }
            if (b){continue;}
            t.push_back(m);
            k++;
        }
    }
    o<<t.size();
}