# include<fstream>
# include<bits/stdc++.h>
using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int N,l=1,m;
double a[1000];
int main()
{
	fin>>N;
	for (int i=1 ; i<=N;i++)
	for (int k=1 ;k<=N;k++)
	{a[l]=i*1.0/k*1.0;
	l++;
    }
    N=0;
    for (int i=1 ; i<l;i++)
	{
		m=1;
		for (int k=i+1 ;k<=l;k++)
	    if (a[i]==a[k]) m=0;
	    if (m==1) N++;
    }
    fout<<N;
	return 0;	
}