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