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#include<bits/stdc++.h>
using namespace std;
int tab[50000];
int main()
{
	int n, w =0, m = 0, temp = 1, temp2 = 1, i;
	
	cin >> n;
	for(i = 0; i < n; i++) {cin >> tab[i];}
	
	for(i = 1; i < n; i++) {
		if(i % 2 == 1) {
			if(tab[i-1] >= tab[i]) temp++;
			else {
				w += temp/2;
				temp = 1;
			}
		}
		else {
			if(tab[i-1] <= tab[i]) temp++;
			else {
				w += temp/2;
				temp = 1;
			}
		}
		if(i % 2 == 1) {
			if(tab[i-1] <= tab[i]) temp2++;
			else {
				m += temp2/2;
				temp2 = 1;
			}
		}
		else {
			if(tab[i-1] >= tab[i]) temp2++;
			else {
				m += temp2/2;
				temp2 = 1;
			}
		}		
	}
	m += temp2/2;
	w += temp/2;
	cout << min(w,m);


return 0;
}