#include<fstream>
using namespace std;

fstream f("fractii.in",ios::in),g("fractii.out",ios::out);

int n,rez=0;

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

main()
{
int i,j;
f>>n;
for(i=1;i<=n;i++)
	{
	for(j=1;j<=n;j++)
		{
		if(cmmdc(i,j)==1)rez++;
		}
	}
g<<rez;
}