#include <iostream>
#include <fstream>
using namespace std;
int main(void)
{
	ifstream f("fractii.in");
	ofstream g("fractii.out");
	int n;
	f>>n;
	int p[n],q[n],i,j,k=0;
	for (i=1;i<=n;i++)
		p[i]=i;
	for (j=1;j<=n;j++)
		q[j]=j;
	for (i=1;i<=n;i++)
	{
		for (j=1;j<=n;j++)
		{
			if (p[i]%q[j]!=0 || p[i]==1 || q[i]==1)
				k++;
		}
	}
	g<<k;
	
	
	
	
	f.close();
	g.close();
return 0;
}