#include "stdafx.h"
#include <iostream>
using namespace std;
#include <conio.h>
#include <fstream>

int main()
{long int n, i, j, k,x,min,l;
	ifstream f("fractii.in");
		f>>n; 
	f.close();
	x=2*n-1;
for(i=2;i<=n;i++)
for(j=2;j<=n;j++){
    if(i>j)min=j; else min=i; l=0; 
    for(k=2;k<=min;k++)if((i%k==0)&&(j%k==0))l++;
     if(l==0)x++;}
    ofstream f1("fractii.out");
	f1<<x;
    f1.close(); 
	return 0;
}