#include<fstream>
using namespace std;
int cmmdc(int a, int b){
	int c;
	while(b){
		c=a%b;
		a=b;
		b=c;
	}
	return a;
}
int main(){
	int s=1,n,i,j,c;
	ifstream f("fractii.in");
	f>>n;
	f.close();
	i=1;
	j=2;
	c=2;
	while(c<=n){
		i=1;
		j=c;
		while(j<=n){
			if(i==1||j==1)
				s+=2;
			else if(cmmdc(i,j)==1)
				s+=2;
			i++;
			j++;
		}
		c++;
	}
	ofstream g("fractii.out");
	g<<s;
	g.close();
	return 0;
}