#line 1 "main.cpp"
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;
#line 2 "my-library\\library\\math\\quotient.hpp"
#include <concepts>
#line 6 "my-library\\library\\math\\quotient.hpp"
using namespace std;
namespace asalib {
  namespace math {
    template<integral T>
    constexpr vector<tuple<T, T, T>> floor_quotient(T n) {
      vector<tuple<T, T, T>> res;
      for (T i = 1; i <= n; ++i) {
        T v = n / i;
        res.push_back({ v, i, n / v });
        i = n / v;
      }
      return res;
    }
    template<integral T>
    constexpr vector<tuple<T, T, T>> ceil_quotient(T n) {
      vector<tuple<T, T, T>> res;
      for (T i = 1; i <= n; ++i) {
        T v = (n + i - 1) / i;
        if (i == n) {
          assert(v == 1);
          res.push_back({ v, i, i });
        }
        else {
          assert(v > 1);
          T j = (n + v - 2) / (v - 1) - 1;
          res.push_back({ v, i, j });
          i = j;
        }
      }
      return res;
    }
  }
}
#line 8 "main.cpp"
int main() {
  ll n;
  cin >> n;
  auto v = asalib::math::floor_quotient(n);
  cout << v.size() << endl;
  return 0;
}