#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;
	set<int> s;
	for (int i = 1; i <= n; ++i)
		s.insert(n / i);

	cout << s.size() << "\n";

	return 0;
}