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