#include<stdio.h>
int n,nr=0,i,j;
int cmmdc(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);
	scanf("%d",&n);
	for(i=1;i<=n;++i)
		for(j=1;j<=n;++j)
			if(cmmdc(i,j)==1) ++nr;
	printf("%d",nr);
return 0;
}