#include <iostream>
#include <fstream>
using namespace std;

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

    int n, nr = 0;
    in>>n;

    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            if( (i % j != 0 && j % i != 0 ) || (i == 1 || j == 1)){
                nr++;
            }
        }
    }
    out<<nr;

    return 0;
}