#include <bits/stdc++.h>
#define MAP(BODY) Map([](auto const X1) { return BODY; })
#define vec(N, I) make_vec(N, I)
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
template <class N, class T>
std::vector<T> make_vec(N n, T i)
{
  return std::vector<T>(n, i);
}
template <class A, class F>
auto operator|(const A &a, const F &f)
{
  return f(a);
}
template <class T>
std::ostream &operator<<(std::ostream &os, const std::vector<T> &vec)
{
  os << "[";
  const size_t vec_len = vec.size();
  if (vec_len > 0)
  {
    for (int i = 0; i < vec_len - 1; i++)
    {
      os << vec[i] << ',' << ' ';
    }
    os << vec[vec_len - 1];
  }
  os << "]\n";
  return os;
}
template <class T>
std::ostream &operator<<(std::ostream &os, const std::set<T> &vec)
{
  os << "{";
  auto i = vec.begin();
  while (i != vec.end())
    std::cout << *i++ << ",";
  os << "\b}";
  return os;
}
template <class T, class A>
std::ostream &operator<<(std::ostream &os, const std::vector<std::pair<T, A>> &vec)
{
  os << '{';
  vec | MAP(({ std::cout << "<" << X1.first << "," << X1.second << ">" << std::endl, X1; }));
  os << "}\n";
  return os;
}
template <class A, class B>
std::ostream &operator<<(std::ostream &os, const std::pair<A, B> &tar)
{
  os << '<' << tar.first << ',' << tar.second << '>' << std::endl;
  return os;
}

auto print = [](const auto a)
{
  std::cout << a << std::endl;
  return a;
};
template <class F>
auto Map(F f)
{
  return [=](const auto &ma)
  { return map_instance(f, ma); };
}
template <class F, class A>
auto map_instance(F f, const std::vector<A> &vec)
{
  using R = typename std::result_of<F(A)>::type;
  int size = vec.size();
  std::vector<R> result(size);
  for (int i = 0; i < size; i++)
  {
    result[i] = f(vec[i]);
  }
  return result;
}
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;
typedef unsigned long long int ull;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<int, int> pi;
ll N;
bool prime(int n)
{
  // 0,1の場合は素数ではない
  if (n < 2)
    return false;
  // √n まででよいということは i*i<=n  までチェックすることと同じ
  for (int i = 2; i * i <= n; i++)
  {
    if (n % i == 0)
    {
      return false;
    }
  }
  // １と自分自身以外で割り切れる数が無かったので素数
  return true;
}
int main()
{
  cin >> N;
  ll n = 2;
  ull result = 0;
  // N|print;
  // n|print;
  while (n * n <= N)
  {
    n | print;
    ll prev = n ;
    while (prev * n <= N)
    {
      result += prev * n;
      prev *= n;
    }
    n++;
    while (!prime(n))
    {
      n++;
    }
  }

  result | print;
}