#include<iostream>
#include<fstream>
using namespace std;
int cmmdc(int x, int y)
{int r;

do
	{r=x%y;
	x=y;
	y=r;
	}
while(r!=0);
return x;
}

int main()
{int x,y,n,nr=1;
ifstream f("fractii.in");
ofstream g("fractii.out");
f>>n;
for(x=1;x<=n;x++)
	for(y=x+1;y<=n;y++)
		if(cmmdc(x,y)==1)nr=nr+2;
g<<nr;
f.close();
g.close();
}