#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("fractii.in");
ofstream fout("fractii.out");
int n, total = 0, i = 0, j = 0;

bool prim(int i, int j)
{
    int r = 0;
    while(j)
    {
        r = i % j;
        i = j;
        j = r;
    }
    if(i == 1)
        return true;
    return false;
}

int main()
{
    fin>>n;
    total = n + n - 1;
    for(i=2; i<=n; i++)
    {
        for(j=2; j<=n; j++)
        {
            if(i % j != 0 && j % i != 0 && prim(i, j) == true)
                total++;
        }
    }
    fout<<total;
    return 0;
}