#include<iostream>
#include<fstream>
using namespace std;

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

int main(){
	int n,i,j,p,q;
	int suma;
	fin >> n;
	
	for (i=1;i<=n;i++){
	  p=i;
	    for (j=1;j<=n;j++) {
	   	  q=j;
			if (p==1 && q==1) suma++;
			 
			  else if (p/j==0 || q/i==0) suma=suma;
			 
			    else suma++ ; 
	   }  	
	}
	fout << suma;
	return 0;
}