#include <iostream>
#include <fstream>
std::ifstream fin("fractii.in");
std::ofstream fout("fractii.out");

int cmmdc(int a,int b)
{
    if(a==b && a==1)
        return 1;
    if(a==b)
        return a;
    if(a>b)
        return cmmdc(a-b,b);
    return cmmdc(a,b-a);
}
int main(int argc, char *argv[])
{
    int a, rez = 0;
    fin >> a;
    rez = a;
    for (int i = 2; i <= a; i++)
    {
        for (int j = 1; j <= a; j++)
        {
            if (cmmdc(i, j) == 1)
            {
                rez++;
            }
        }
    }
    fout << rez;
    return 0;
}