#include <iostream>
#include <fstream>

using namespace std;


long cmmdc(long a, long b)
{
	if(a == b)
		return a;
	else
		if(a>b)
			return cmmdc(a-b,b);
		else
			return cmmdc(a,b-a);
}

int main()
{
	long n;

	ifstream f;
	ofstream g("fractii.out");
	f.open("fractii.in");

	f>>n;
	int cnt = 0;

	for(long i = 1;i <=n;i++)
		for(long j=1;j<=n;j++)
			if(cmmdc(i,j) ==1) cnt++;

	g<<cnt;
}