#include<fstream>
using namespace std;
ifstream f("bad.in");
ofstream g("bad.out");
unsigned long long i,j,n,nr;
long long int gcd(long long int a, long long int b)
{
	long long int c;
	while(b)
	{
		c=a%b;
		a=b;
		b=c;
	}
	return a;
}
int main()
{
	f>>n;
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			if(gcd(i,j)==1) nr++;
	g<<nr;
	f.close();
	g.close();
	return 0;
}





/*#include<fstream>
using namespace std;
ifstream f("bad.in");
ofstream g("bad.out");
unsigned a[10][10],i,j,col[10],lin[10],n,m,maxim,k,s,coloana,linie,y;
int main()
{
	f>>n>>m>>k;
	for(i=1;i<=n;i++)
		for(j=1;j<=m;j++)
			f>>a[i][j];
	while(k)
	{
	maxim=0;
	for(i=1;i<=n;i++)
		for(j=1;j<=m;j++)
		{
			
			s=0;
			s+=a[i][j]+a[i-1][j]+a[i+1][j]+a[i][j-1]+a[i][j+1];
			if(s>maxim)
			{
				maxim=s;
				coloana=j;
				linie=i;
			}
		}
		y++;
		g<<coloana<<' '<<linie<<' '<<maxim<<'\n';
		col[y]=coloana;
		lin[y]=linie;
		a[linie][coloana]=a[linie-1][coloana]=a[linie+1][coloana]=a[linie][coloana-1]=a[linie][coloana+1]=0;
		k--;
	}
	f.close();
	g.close();
	return 0;
}
		
*/