#include <fstream.h>
using namespace std;
unsigned long cmmdc(unsigned long a, unsigned long b)
{unsigned long r; while(a%b!=0)
{r=a%b; a=b; b=r;}
return b;}

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