#include <stdio.h>
#include <iostream>
using namespace std;
typedef long long ll;
int main(){
	ll a;
	cin>>a;
	ll ans = 0;ll temp = 0;ll t;
	for(ll i = 1;i*i*i<=a;i++,ans++){
		t = a/i;
		for(ll j= i+1;j*j<=t;j++)
		  temp+=a/(i*j)-j;
	}
	ans+=temp*6;
	temp = 0;
	for(ll i = 1;i*i<=a;i++){
		t = i*i;
		temp+=a/t;
		if(t*i<=a) temp--;
	}
	ans+=temp*3;
	cout<<ans;
	return 0;
}