#include <bits/stdc++.h>
using namespace std;

const double EPS = 1e-9;

int main() {
  int n;
  cin >> n;
  set<int> count;
  for (int i = 1; i <= n; i++) {
    count.insert(n / i);
  }
  cout << count.size() << '\n';
  return 0;
}