# include <fstream.h>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int main ()
{
	int  i, j, n,u , o, c ;
	float s;
	
	f>>n;
	o=0;
	for(i=1;i<=n;i++)
	{
		
		for(j=1;j<=n;j++)
		{
			s=0;
			c=0;
			s=i/j;
			for(u=1;u<=9;u++)
			{
				if(s%u==0)
					c=c+1;
			}
			if(c==0)
				o=o+1;
		}
	}
		g<<o;
		return 0;
}