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/*
 * orn.ccp
 *
 *  Created on: Dec 13, 2022
 *      Author: A.Mulawa
 */

#include <iostream>
#include <string>
#include <limits.h>


int main(int argc, char **argv) {
	int k;
	std::cin >> k;
			bool up = false;
			int t0;
			std::cin >> t0;
			int t1;
			std::cin >> t1;
			int res = 0;
			if (t0 > t1)
			{
				up = true;
			}
			else if (t0 == t1) {
				res ++;
				t1 = INT_MAX;
			}

			for (int i = 2; i < k; i++) {
				int tn;
				std::cin >> tn;
				if (up) {
					if (t1 >= tn)
					{
						tn = INT_MIN;
						res ++;
					}
				}
				else if (t1 < tn)
				{
					res ++;
					tn = INT_MAX;
				}
				up = !up;
				t1 = tn;
			}

			std::cout << res;
}