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#include<iostream>
#include<string>

using namespace std;

int main() {

	int cnt = 0;

	int n;
	cin >> n;

	int prev;
	cin >> prev;

	int grow = 0;

	for (int i = 1; i < n; i++) {

		int x;
		cin >> x;

		if (grow == 1 && x >= prev) {
			cnt++;
			grow = -2;
			continue;
		}
		if (grow == -1 && x <= prev) {
			cnt++;
			grow = 2;
			continue;
		}

		if (grow == -2) {
			grow = 1;
			prev = x;
			continue;
		}
		if (grow == 2) {
			grow = -1;
			prev = x;
			continue;
		}

		if (grow == 0) {
			if (x == prev) {
				cnt++;
				grow = 1; 
			}
			else if (x > prev) {
				grow = 1;
			}
			else {
				grow = -1;
			}
		}


		prev = x;

	}

	cout << cnt;

}