#include <fstream.h>


long cmmdc(long a,long b)
{
	while(b!=0)
	{
		int r=a%b;
		a=b;
		b=r;
	}

		return a;
}


int main()
{
	long n,nr;
	ifstream f("fractii.in");
	ofstream g("fractii.out");
	f>>n;
	nr=n*2;
	for(int i=2;i<=n;i++)
	{
		for(int j=2;j<=n;j++)
			if(cmmdc(i,j)==1)
				nr++;
	}
	g<<nr-1;
	f.close();
	g.close();
	return 0;
}