#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int n;
int i, j;
int nrf=0;

int cmmdc(int a, int b)
{
    int c;
    while(b!=0)
    {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}

int main()
{
    fin >> n;
    for(i=1;i<=n;i++)
    {
        nrf++;
        for(j=2;j<=n;j++)
            if(cmmdc(i,j)==1)
            nrf++;
    }
    fout << nrf<< '\n';
    return 0;
}