#include <bits/stdc++.h>
#define int long long
#define double long double
using namespace std;
const int MOD = 1000000007;
const int INF = 1e14;
using Graph = vector<vector<int>>;

signed main(){
  int N;
  cin >> N;
  set<int> ans;
  for( int i = 1; i <= N; i++ ) ans.insert(N/i);
  cout << ans.size() << endl;
}