#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,a,q,p,nr=0,b;

int cmmdc(int a,int b)
{
    if(a!=b)
        if(a>b)
            return cmmdc(a-b,b);
        else
            return cmmdc(a,b-a);
}
int main()
{
    f>>n;
    for(p=1;p<=n;p++)
        for(q=1;q<=n;q++)
            if(q==1)
                nr++;
            else
                if(cmmdc(p,q)==1)
                    nr++;
    g<<nr;
    f.close();
    g.close();
    return 0;
}