#include<iostream.h>
#include<fstream.h>
int main ()
{
unsigned int p,q,n,c=0;
ifstream a("fractii.in");
a>>n;
a.close();
for(p=1;p<=n;p++)
{
for(q=1;q<=n;q++)
{
if(p%q!=0)
{
c++;
}
}
}
ofstream  v("adunare.out");
v<<c;
v.close();
return 0;
}