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

int a[100005];

int main(){
  int n; cin >> n;
  int ans = 0;
  for(int i = 1; i <= n; i++) a[n/i]++;
  for(int i = 1; i <= n; i++){
    if(a[i]>0) ans++;
  }
  cout << ans << endl;
  return 0;
}