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