#include<fstream.h>

int euclid(long a,long b)
{
	long tmp;
	if(!(!a%2&&!b%2))
	while(b!=0)
	{
		tmp=a%b;
		a=b;
		b=tmp;
	}
	else a=2;
	return a;
}

int main()
{
	long n,i,j,contor;

	ifstream fin("fractii.in");
	ofstream fout("fractii.out");
	fin>>n;
	contor=n;
	for(i=2;i<=n;i++)
		for(j=1;j<=n;j++)
			if(euclid(i,j)==1)contor++;
	fout<<contor;
	return 0;
}