#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in.txt");
ofstream g("fractii.out.txt");
unsigned int cmmdc(unsigned int a, unsigned int b);
unsigned int cmmdc(unsigned int a, unsigned int b)
{
	unsigned int c;
	while (b!=0)
	{
		c = a%b;
		a = b;
		b = c;
	}
	return a;
}

int main()
{
	unsigned int n, i, j, count = 0;
	f >> n;
	for (i = 1; i <= n; i++)
	{
		for (j = 1; j <= n; j++)
		{
			
				if (cmmdc(j, i) == 1)
					count++;
			
		}
	}
	g << count << endl;
	//system("pause");
	return 0;
}