#include<iostream>
#include<fstream>
using namespace std;
long cmmdc(long a, long b)
{
	if(a==b)
		return a;
	else
		if(a>b)
			return cmmdc(a-b,b);
		else
			return cmmdc(a,b-a);
}
int main()
{
	ifstream f("fractii.in");
	ofstream g("fractii.out");

	unsigned long n, i, j;
	long long s=0;
	f>>n;
	s=2*n-1;
	for(i=2;i<=n;i++)
		for(j=2;j<=n&&i!=j&&i%j!=0&&j%i!=0;j++)
			if(cmmdc(i,j)==1)
				s++;
	g<<s;		
	f.close();
	g.close();
	return 0;
}