#include <iostream>
#include <fstream>
using namespace std;

ifstream f("fractii.in");
ofstream g("fractii.out");

bool prime_intre_ele(int a, int b)
{
    while(b!=0)
    {
        int r=a%b;
        a=b;
        b=r;
    }
    if(a==1)
        return true;
    return false;
}

int cate_prime(int n)
{
    int cnt=0;
    for(int i=2; i<=n; i++)
        for(int j=2; j<=n; j++)
            if(prime_intre_ele(i, j))
                cnt++;
    return cnt+2*n-1;
}

int main()
{
    int n;
    f>>n;
    g<<cate_prime(n);
}