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#include <iostream>
using namespace std;

int main() {
	int counter1 = 0, counter2 = 0, n;
	cin >> n;
	int tab[n];
	
	for (int i = 0; i < n; i++) {
		cin >> tab[i];
	}
	
	for (int i = 1; i < n; i++) {
		if (tab[i] <= tab[i - 1]) {
			i++;
			counter1++;
		}
	}
	
	for (int i = 1; i < n; i++) {
		if (tab[i] >= tab[i - 1]) {
			i++;
			counter2++;
		}
	}
	
	cout << min(counter1, counter2);
}