#include<fstream>
using namespace std;
int main ()
{
    ifstream fin ("fractii.in");
    ofstream fout ("fractii.out");
    long n,p,q=1,k=0,i;
    fin>>n;
    for(p=1,i=1;i<=n,p<=n;p++)
    {
                                  while(q<=n)
                                  {
                                             if(p%i==0&&q%i==0)
                                             k++;
                                             q++;
                                             }
                                             }
                                             fout<<k;
                                             return 0;
                                             }