#include<fstream.h>
using namespace std;

int main()
{
long long n,p=1,q=1,nr=0,ok,i;


ifstream in("fractii.in");
ofstream out("fractii.out");
in >> n;
while (q<=n&&n<=1000000)
{

	while (p<=n)
{ 	
	ok=1;
	i=2;
	
	while (i<=n)
	{
		if (p%i==0&&q%i==0) ok=0;
		
		i++;
	}	
	
	
	if (ok==1)nr++;
	p++;
}
p=1;
q++;
}



out<<nr;
	
in.close();
out.close();
return 0;
}