#include<fstream>
#define maxn 1000000

using namespace std;

ifstream in("fractii.in");
ofstream out("fractii.out");

int n;

int gcd(int a, int b)
{
    if (!b) return a;
    return gcd(b, a % b);
}

int main()
{
	in>>n;
	int rasp=2*n-1;
	for(int i=2;i<=n;i++)
		for(int j=2;j<=n;j++)
		{
			if(gcd(i,j)==1)
				rasp++;
		}
	out<<rasp<<"\n";
	return 0;
}