#include <iostream>
#include <fstream>

using namespace std;

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

int cmmdc(int, int);

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

int main()
{
    int n, i=0;
    fin>>n;
    for(int a=1;a<=n;a++)
        for(int b=2;b<=n;b++)
            if(cmmdc(a, b)==1)
                i++;
    fout<<(i+n);
    return 0;
}