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#include <iostream>

using namespace std;
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int a = 0, b = 0, c = 0, d = 0;
	cin >> a;
	if (a == 1) {
		cin >> b;
		cout << "0";
		return 0;
	}
	cin >> b >> c;
	if (b == c) {
		d++;
	}
	if (c > b) {
		for (int i = 0; i < (a - 2) / 2; i++) {
			cin >> b;
			if (b > c) {
				d++;
			}
			cin >> c;
			if (b >= c) {
				d++;
			}
		}
		if (a % 2 != 0) {
			cin >> b;
			if (b > c) {
				d++;
			}
		}
	}
	else {
		for (int i = 0; i < (a - 2) / 2; i++) {
			cin >> b;
			if (b < c) {
				d++;
			}
			cin >> c;
			if (b <= c) {
				d++;
			}
			if (a % 2 != 0) {
				cin >> b;
				if (b > c) {
					d++;
				}
			}
		}
	}
	cout << d;
}