#include <iostream>
#include <fstream>
using namespace std;
unsigned div(unsigned a,unsigned b)
{
    unsigned r=a%b;
    while(r)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}
int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    unsigned N,i,j,nr;
    f>>N;
    nr=N;
    for(i=2;i<=N;i++)
        for(j=1;j<=N;j++)
            if(div(i,j)==1)
                nr++;
    g<<nr;
    return 0;
}