#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int cmmdc(int a,int b)
{
    while(a!=b)
    {
        if(a>b)
            a-=b;
        else
            b-=a;
    }
    return a;

}
int main()
{
    int N,nr;
    f>>N;
    nr=N;
    for(int i=2;i<=N;i++)
        for(int j=1;j<=N;j++)
            if(cmmdc(i,j)==1)
                nr++;
    g<<nr;
    return 0;
}