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#include <iostream>

int* loadRecords(int length)
{
	int* records = new int[length];
	for (int i = 0; i < length; i++)
	{
		std::cin >> records[i];
	}
	return records;
}

int main()
{
	int recordLength = 0;

	std::cin >> recordLength;

	int* pitchArray = loadRecords(recordLength);

	int result = 0;

	bool pitchIncrease = false;
	pitchIncrease = pitchArray[1] > pitchArray[0];
	bool changed = false;

	for (int i = 1; i < recordLength; i++)
	{
		if (changed)
		{
			changed = false;
			continue;
		}
		if (pitchArray[i] == pitchArray[i - 1])
		{
			result++;
			changed = true;
			if (i + 1 < recordLength && pitchArray[i] != pitchArray[i+1])
			{
				pitchIncrease = pitchArray[i] < pitchArray[i + 1];
			}
		}
		else if (pitchArray[i] > pitchArray[i - 1] && !pitchIncrease)
		{
			result++;
			changed = true;
		}
		else if (pitchArray[i] < pitchArray[i - 1] && pitchIncrease)
		{
			result++;
			changed = true;
		}
		pitchIncrease = !pitchIncrease;
	}

	std::cout << result;

	return 0;
}