#include<iostream>
#include<fstream>

using namespace std;

int main()
{
	int suma = 0;
	fstream file("fractii.in", ios::in);
	int n;
	file >> n;
	file.close();

	file.open("fractii.out", ios::out);
	float a[100000];
	int index = 0;
	float nr = 0;
	for (int i = 1; i <= n; i++){
		for (int j = 1; j <= n; j++)
		{
			nr = (float)i / (float)j;
			bool contains = false;
			for (int k = 0; k < index; k++)
			{
				if (a[k] == nr)
				{
					contains = true;
					break;
				}
			}
			if (!contains)
			{
				a[index] = nr;
				index++;
			}
		}
	}
	file << index;
	file.close();

	return 0;
}