#include <fstream>

using namespace std;

ifstream in("fractii.in");
ofstream out("fractii.out");

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

int main()
{
	long n,i,j,lol=0;
	in>>n;
	for (i=1;i<=n;i++)
		for (j=1;j<=n;j++)
			if (cmmdc(i,j)==1)
				lol++;
	out<<lol;
	return 0;
}