#include <iostream>
#include <fstream>
using namespace std;
int cmmdc(int a,int b)
{
    int r=a%b;
    while(r)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}

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