#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

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