#include<stdio.h>
int cm(int a,int b)
{
	while(a!=b)
		if(a>b)
			a-=b;
		else
			b-=a;
	return a;
}
int main()
{
	freopen("fractii.in","r",stdin);
	freopen("fractii.out","w",stdout);
	int i,j,n,nr=0;
	scanf("%d",&n);
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			if(cm(i,j)==1)
				nr++;
	printf("%d\n",nr);
 return 0;
}