#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  int N; cin >> N;
  map<int, int> mp;
  for(int i = 1; i <= N; i++){
    mp[N/i]++;
  }
  cout << mp.size() << endl;
}