using namespace std;
#include<fstream>
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int main()
{
	unsigned int N, contor=0, s,j;
	do
	{fin>>N;}while(N>1000000);
	for(s=1; s<=N; s++)
	{	for(j=1; j<=N; j++)
				{if(j==1)
				contor++;
				else	
				{if(s%j!=0&&s/j!=s&&j/s!=s)
					contor++;
				}
			}
	}
	fout<<contor;
	return 0;
}