#include <iostream>
#include <fstream>

std::ifstream fin("fractii.in");
std::ofstream fout("fractii.out");

void citeste()
{
	long long n = 0, nr = 0;
	fin>>n;

	for(long long i = 1 ; i <= n ; i++)
	{
		for(long long j = i; j <= n ; j++)
		{
			if(i % j == 0)
			{
				nr++;
			}
		}
	}
	fout<<nr;
}

int main()
{
	citeste();
	return 0;
}