#include<stdio.h>
int n,p,q;
int cmmdc()
{
	int r=0;
	if(p<q)
	{
		r=p;
		p=q;
		q=r;
	}
	while(p%q)
	{
		r=p%q;
		p=q;
		q=r;
	}
	return q;
}
int main()
{
	int nrfractii=0;
	freopen("fractii.in","r",stdin);
	freopen("fractii.out","w",stdout);
	scanf("%d",&n);
	for(p=1;p<=n;++p)
		for(q=2;q<=n;++q)
		{
			cmmdc();
			if(q==1)
				++nrfractii;
		}
	printf("%d",nrfractii);
	return 0;
}