#include<iostream>
#include<fstream>
#include<math.h>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
//fractii ireductibile

int ireductibil(int x,int y)
{
        int p=1;
        if(x%y==0)p=0;
        else if(y%x==0)p=0;
        
        return p; 
     }


int main()
{   int k=0,n;
    f>>n;
    
    int i,j;
    
    for(i=1;i<=n;i++)
     for(j=1;j<=n;j++)
       if(ireductibil(i,j))k++;
       
       g<<k;

   return 0;
}