#include <stdio.h>
int cmmdc(int a,int b)
{
while((a!=b)&&(a)&&(b)) {
	if(a>b) a=a-b;
	else b=b-a; }
if((a==b)&&(a!=1)) return 0;
	else return 1; 
}

int main() {
	freopen("fractii.in" , "r" , stdin);
	freopen("fractii.out", "w", stdout);
	int n,i,j,s=0;
	scanf("%d" , &n);
	for (i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			 if(cmmdc ( i,j )) s++;
printf("%d" , s);
}