#include<fstream>
#include<math.h>

using namespace std;

int n,k=0;
float a[100000];
int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
float i,j;
int l,m,n;
fin>>n;
for(i = 1; i <= n; i++)
{
      for(j = 1; j <= n; j++)
           a[k++]=(i/j);
}
for(m = 0; m < k; m++)
{
      for(n = m+1; n < k; n++)
            if(a[m] == a[n])
            {
            for(l = n; l < k; l++)
            a[l] = a[l+1];
            k--;
            }
}
fout<<k;
fin.close();
fout.close();

return 0;

}