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#include<bits/stdc++.h>
using namespace std;

int main(){
	cout.tie(0);
	cin.tie(0);
	ios_base::sync_with_stdio(0);	
	int n;
	cin >> n;
	int a[n];
	for(int i = 0;i < n; i++){
		cin >> a[i];
	}
	int l = a[0], alt = 1, fin = 0;
	bool changed = 0;
	for(int i = 1;i < n; i++){
		if((l<=a[i]&&alt==1)){
			fin++;
			l=-1000001;
			changed = 1;
		}
		if((l>=a[i]&&alt==-1)){
			fin++;
			l=1000001;
			changed = 1;
		}
		if(!changed){
			l=a[i];
		//	cout << i;
		} 
		changed = 0;
		alt*=-1;
	}
//	cout << '\n';
	int fin2 = 0; alt=-1; l=a[0];
	changed = 0;
	for(int i = 1;i < n; i++){
		if((l<=a[i]&&alt==1)){
			fin2++;
			l=-1000001;
			changed = 1;
		}
		if((l>=a[i]&&alt==-1)){
			fin2++;
			l=1000001;
			changed = 1;
		}
		if(!changed){
			l=a[i];
		//	cout << i;
		} 
		changed = 0;
		alt*=-1;
	}
//	cout << '\n';
	cout << min(fin,fin2);
	return 0;
}