#include<fstream>
using namespace std;

int cmmdc(int a,int b)
{
	int r;
	while(b!=0)
	{
		r=a%b;
		a=b;
		b=r;
	}
	return a;
}

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