#include <iostream>
#include<fstream>


using namespace std;

int n,p=0,k,aux;
float i,j,v[10000000]={},x;
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    f>>n;

    for(i=1;i<=n;i++)
        for(j=1;j<=n;j++)
        {
            aux=1;
            x=i/j;
            for(k=0;k<=p;k++)
                if(x==v[k])
                {
                    aux=0;
                    break;
                }
            if(aux==1)
                v[p++]=x;
        }
    g<<p;

    return 0;
}