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

fstream f,g;

int n;
float fractii[100];

int counter=0;

int main()
{
    f.open("fractii.in",ios::in);
    g.open("fractii.out",ios::out);

    f>>n;
    for(int m=0;m<100;m++)
    {
        fractii[m]=0;
    }

    int k;
    float rez;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
        {

            k=0;
            rez=(float)i/j;
            while((rez!=fractii[k]) && (k<counter))
            {
                k++;
            }
            if(k==counter)
            {
                counter++;
                fractii[counter]=rez;

            }
        }
    }

    g<<counter;
    f.close();
    g.close();
    return 0;
}