#include <fstream>
#include <iomanip>

using namespace std;

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

int n,result;

int divComun(int i,int j)
{
	if(i == 1 && j == 1)
		return 1;
	else if( i == 1 || j == 1)
		return 2;
	if(i == j)
		return 0;
	if(i % j == 0)
		return 2;
	if(j % i == 0)
		return 2;
	return 0;
}

void solve()
{
	for(int i = 1; i <= n; i++)
		for(int j = 1; j < n;j++)
		{
				result += divComun(i,j);
		}
}

int main()
{
	in >> n;
	in.close();
	solve();
	out << result;
	out.close();
	return 0;
}