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