#include <iostream>
#include <fstream>

using namespace std;

int n, contuar = 0, duplicat, numerotare = 0;
double v[1000000];
fstream fractiiin, factiiout;

int main()
{
	fractiiin.open("fractii.in", ios::in);
	factiiout.open("fractii.out", ios::out);

	while (!fractiiin.eof())
	{
		fractiiin >> n;
		numerotare = 0;

		for (double i = 1; i <= n; i++)
		{
			for (double d = 1; d <= n; d++)
			{
				duplicat = 0;

				for (int a = 0; a < n * n; a++)
				{
					if (v[a] == i / d)
						duplicat = 1;
				}
				if (duplicat == 0)
				{
					v[numerotare] = i / d;
					numerotare++;
				}
			}
		}
		for (int i = 0; i < n * n; i++)
			v[i] = 0;
		factiiout << numerotare << endl;
	}
	fractiiin.close();
	factiiout.close();

	system("pause");
}