#include <iostream>
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int divx(int x, int y) {
int i;
if (y%x == 0) return 0;
for (i=2; i<=x/2; i++) if (x%i == 0 && y%i == 0) return 0; return 1;
}
int main()
{
    int n, i, j, nr=0;
    f>>n;
    for (i=2; i<=n; i++) for (j=2; j<=n; j++) if (i%j != 0 && divx(i, j)==1) nr++;
    g<<nr+n*2-1;
    f.close(); g.close();
    return 0;
}