#include <stdio.h>
FILE* f;
FILE* s;
long int n;
long int p,q;
long int cat;
main()
{
	f=fopen ("fractii.in","r");
	s=fopen ("fractii.out","w");

	fscanf (f,"%ld",&n);

	cat=0;
	for (p=1;p<=n;p++)
	{
		for (q=1;q<=n;q++)
		{
			if (p%q>0)
				cat++;

			if (p%q==0&&p==q)
				cat++;
		}
	}

	fprintf (s,"%ld",cat);

	fclose (f);
	fclose (s);

}