#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{
    if(a==1 || b==1)return 0;
    if(a%b==0)return b;
    cmmdc(b,a%b);
}

int main()
{
    int n;
    ifstream f("fractii.in");
    f>>n;
    f.close();
    int s=n;
    for(int i=2;i<=n;i++)
        for(int j=1;j<=n;j++)
    {
        if(!cmmdc(i,j))s++;
    }
    ofstream g("fractii.out");
    g<<s;
    return 0;
}