#include<fstream>
using namespace std;
ifstream cin("fractii.in");
ofstream cout("fractii.out");
bool cmmdc(int x,int y)
{
	int r=x%y;
	while(r!=0)
	{
		x=y;
		y=r;
		r=x%y;
	}
	if(y==1)
		return true;
	else
		return false;
}
int main()
{
	int n,i,j,k=0;
	cin>>n;
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			if(cmmdc(i,j))
				k++;
	cout<<k;
	return 0;
}