#include <fstream>
using namespace std;
int main()
{int n;
float q,i,j;
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
float v[1000];
int l,p,aux,k;
i=0;
p=0;
while(i<n)
{i++;
j=0;
while(j<n)
   {j++;
 q=i/j;
       v[p]=q;
       p++;
   }
}
l=0;
aux=p;
while(l<p)
{l++;
k=l;
    while(k<=p)
    {k++;
if(v[k]==v[l])
        aux--;
    }

}

g<<aux;
    return 0;
}