#include<fstream.h>
int n,i,j,k;
int cmmdc(int a, int b)
{
	while(a!=b)
	{
		if(a>b)a-=b;
		else b-=a;
	}
	return a;
}
int main()
{
	ifstream f("fractii.in");
	ofstream g("fractii.out");
	f>>n;
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			if(cmmdc(i,j)==1)k++;
	
	g<<k;
	
}