#include<stdio.h>
using namespace std;

int u(int a,int b)
{
	int r;
	while(b)
	{ 
		r=a%b;
		a=b;
		b=r;
	}
	return a;
}
int main()
{
	freopen("fractii.in","r",stdin);
	freopen("fractii.out","w",stdout);
	int n,i,j,nr;
	scanf("%d",&n);
	nr=n;
	for(i=2;i<=n;i++)
		for(j=1;j<=n;j++)
			if(u(i,j)==1)
				nr++;
	printf("%d",nr);
	return 0;
}