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#include <iostream>
#include <vector>

int main()
{
	int n;
	std::cin >> n;
	std::vector<int> sounds(n);
	for (int i = 0; i < n; i++)
	{
		std::cin >> sounds[i];
	}

	bool less, same;
	int result = 0;
	for (int i = 1; i < n; i++)
	{
		if (i == 1)
		{
			less = sounds[i - 1] > sounds[i];
			same = sounds[i - 1] == sounds[i];
			if (same)
			{
				result++;
				i++;
			}
		}
		else if (same)
		{
			less = sounds[i - 1] > sounds[i];
			same = sounds[i - 1] == sounds[i];
			result++;
			i++;
		}
		else if (less && sounds[i - 2] > sounds[i - 1])
		{
			less = sounds[i - 1] > sounds[i];
			same = sounds[i - 1] == sounds[i];
			result++;
			i++;
		}
		else if (!less && sounds[i - 2] < sounds[i - 1])
		{
			less = sounds[i - 1] > sounds[i];
			same = sounds[i - 1] == sounds[i];
			result++;
			i++;
		}
	}

	std::cout << result;
}