Problem:
Score : 200 points

Problem Statement

We have a permutation p = {p_1,\ p_2,\ ...,\ p_n} of {1,\ 2,\ ...,\ n}.

Print the number of elements p_i (1 < i < n) that satisfy the following condition:

p_i is the second smallest number among the three numbers p_{i - 1}, p_i, and p_{i + 1}.

Constraints

All values in input are integers.

3 \leq n \leq 20

p is a permutation of {1,\ 2,\ ...,\ n}.

Input

Input is given from Standard Input in the following format:

n
p_1 p_2 ... p_n

Output

Print the number of elements p_i (1 < i < n) that satisfy the condition.

Sample Input 1

5
1 3 5 4 2

Sample Output 1

2

p_2 = 3 is the second smallest number among p_1 = 1, p_2 = 3, and p_3 = 5. Also, p_4 = 4 is the second smallest number among p_3 = 5, p_4 = 4, and p_5 = 2. These two elements satisfy the condition.

Sample Input 2

9
9 6 3 2 5 8 7 4 1

Sample Output 2

5

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

class Program
{
    public static void Main(string[] args)
    {
        int n = int.Parse(Console.ReadLine());
        string[] inputArray = Console.ReadLine().Split(' ');
        int[] intArray = new int[n];

        int result = 0;

        for (int i = 0; i < n; i++)
        {
            intArray[i] = int.Parse(inputArray[i]);
        }

        for (int i = 0; i < intArray.Length - 2; i++)
        {
            int[] tempNum = new int[3];
            Array.Copy(intArray, i, tempNum, 0, 3);
            if (
                (tempNum[0] > tempNum[1] && tempNum[1] > tempNum[2])
                ||
                (tempNum[0] < tempNum[1] && tempNum[1] < tempNum[2]))
            {
                result++;
            }
        }

        Console.WriteLine(result);
    }
}