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