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#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int n,p,q,nr;
void fractii()
{
nr=0;
for(p=1;p<=n;p++)
{
for(q=1;q<=n;q++)
{
if(p==1||q==1)
nr++;
if(p>q && p%q!=0 && q>1)
{nr++;}
if(q>p&& q%p!=0 && p>1)
{nr++;}
}
}
out<<nr;
}
int main()
{
in>>n;
fractii();
in.close();
out.close();
return 0;
}