#include <fstream>
using namespace std;

int gdc(int i, int j) {

    int q = i / j;
    int r = i % j;
    if(r != 0)  gdc(j, r);
    else    return j;

}

int main()
{
    ifstream in("fractii.in");
    ofstream out("fractii.out");

    int n, s = 0;
    in >> n;
    for(int i = 1; i <= n; ++i) {
        for(int j = 1; j <= n; ++j){
            if(j == 1)  ++s;
            if(j != 1 && gdc(i,j) == 1) ++s;
        }
    }
    out << s;

    return 0;
}