#include <iostream>
#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int main()
{
    int n,p,s=0,nr,i=0;
    float a[100000],x,q;
    in>>n;
    for (p=1;p<=n;p++)
    {
        for (q=1;q<=n;q++)
        {
            nr=0;
            i++;
            x=p/q;
            for (int j=1;j<i;j++)
                if (a[j]==x)
                     nr=1;
            if (nr==0)
            {
                a[i]=x;
                s++;
            }
        }
    }
    out<<s;
}