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//Author:Karolina Miśkiewicz
#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
	int n;
	cin >> n;
	int w1 = 0, w2= 0;
	int temp1 = 0, temp2 =0;
	cin >> temp1;
	temp2 = temp1;
	for(int i = 1; i < n; i++)
	{
	int a;
	cin >> a;
	if(i%2 == 0)
	{
		if(temp1 < a ) //ok
		{
			temp1 = a;
		}
		else//not ok
		{
			w1++;
			temp1 = 1000008;
		}

		if(temp2 > a) //ok
		{
			temp2 = a;
		}
		else //not ok
		{
			w2++;
			temp2 = -1000008;
		}
	}
	else
	{
		if(temp1 > a)//ok
		{
			temp1 = a;
		}
		else //not ok
		{
			w1++;
			temp1 = -1000008;
		}
		if(temp2 < a) // ok
		{
			temp2 = a;
		}
		else //not ok
		{
			w2++;
			temp2 = 1000008;
		}
	}
	}
	cout << min(w1,w2);
}