#include<stdio.h>
int i,n,p,q;
long nr;
int main(void)
{
	freopen("fractii.in","r",stdin);
	freopen("fractii.out","w",stdout);
	scanf("%ld",&n);
	nr=0;
	for(p=1;p<=n;p++)
		for(q=1;q<=n;q++)
			if(p%q&&q%p||p==1||q==1)
			nr++;
	printf("%d\n",nr);
	return 0;
}