#include <bits/stdc++.h>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");

int n, nr;
vector<int> a, b;
int main(){
	in >> n;
	for (int i = 1; i <= n; i++){
		a.push_back(i);
		b.push_back(i);
	}

	for (int i = 1; i <= n; i++){
		for (int j = 1; j <=n; j++){
			if (a[i] % b[j] == 0){
				continue;
			}else{
				nr++;
			}
		}
	}

	out << nr;

	return 0;
}