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#include<iostream>
#include<vector>
using namespace std;
int main()
{
	int wDol=0;
	int wGore=0;
	int n;
	int a;
	vector<int> dane;
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		cin >> a;
		dane.push_back(a);
	}
	int stan;
	int stan_r;
	stan = 1;
	for (int i = 1; i < n; i++)
	{
		if (dane[i - 1] > dane[i])
			stan_r = 1;
		else if (dane[i - 1] < dane[i])
			stan_r = 0;
		else
			stan_r = -1;
		if (stan_r != stan)
		{
			wDol++;
			i++;
		}
		stan = 1 - stan;
	}
	stan = 0;
	for (int i = 1; i < n; i++)
	{
		if (dane[i - 1] > dane[i])
			stan_r = 1;
		else if (dane[i - 1] < dane[i])
			stan_r = 0;
		else
			stan_r = -1;
		if (stan_r != stan)
		{
			wGore++;
			i++;
		}
		stan = 1 - stan;
	}
	if (wDol < wGore)
		cout << wDol;
	else
		cout << wGore;
	return 0;
}