#include <iostream>
#include <cstdint>

using namespace std;

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

	uint32_t N, i;
	cin >> N;

	uint32_t ans = 0, prev = UINT32_MAX;
	for (i = 1; i <= N; ++i)
	{
		const auto cur = N / i;
		if (cur != prev) ++ans;
		prev = cur;
	}

	cout << ans << '\n';
	return 0;
}