#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,nr,ok,k,j,i;
int euclid(int a,int b)
{  int c;
    while(b)
    {
        c=a%b;
        a=b;b=c;
    }
    return a;
}
int main()
{   f>>n;
    nr=n*(n-1)+1;
    for(i=2;i<n;i++)
        for(j=i+1;j<=n;j++)
        if(euclid(i,j)!=1)nr=nr-2;
    g<<nr;



}