#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,j,s,p;
int main()
{
 f>>n;

for (i=1;i<=n;i++)
{
       for (j=1;j<=n;j++)
      {
          p=0;
       if (i==1) {s++;p=1;}
       if ((j==1)&&(p==0))
        {s++;p=1;}
       if ( (i%j!=0) && (j%i!=0) && (p==0)) s++;

      }


}


g<<s;


   f.close();
   f.close();
    return 0;
}