#include<fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int i,j,n,k;
int main()
{
	f>>n;
	for(i=2;i<=n;i++)
		for(j=2;j<=n;j++)
			if(i%j!=0&&j%i!=0)
				k++;
	g<<n+n-1+k;
	return 0;
}