#include<iostream>
#include<fstream>
using namespace std;

int cmmdc(int a, int b)
{
  while (a!=b)
	  if (a>=b) a-=b;
	  else b-=a;
  return a;
}

int main()
{
	int n, i, j, k=0;
	ifstream f;
	f.open("fractii.in");
	f>>n;
	f.close();
	ofstream g;
	g.open("fractii.out");
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			if (cmmdc(i, j)==1) ++k;
	g<<k;				
	g.close();		
	
	return 0;
}