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

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");

    int k=1;
    double i,a,n,j,b;
    f>>n;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            a=i/j;b=a-floor(a);
            if(a-b!=0)
                k++;
        }
    }
    g<<k;

    f.close();
    g.close();


    return 0;
}