#include<iostream>
#include<fstream>
#include<stdlib.h>
#include<stdio.h>

using namespace std;

int main(){
	fstream in("fractii.in",ios::in);
	fstream out("fractii.out",ios::out);

	int n,numar, min, max;
	in>>n;
	numar = 2*n -1;
	for(int i = 1 ; i <= n ;i++){
		for(int j = 1 ; j<= n; j++){
			
			if( i < j){
				min = i;
				max = j;
			}else{
				min = j;
				max = i;
			}
			if(max % min != 0 ){
				numar ++;
			}
		}
	}
	out<<numar;
	return 0;
}