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 (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
int main(){
    int N[30],n;
    int ans = 0;
    scanf("%d", &n);
    for (int a = 0; a < n;a++){
        scanf("%d", &N[a]);
    }
  
    for (int b = 0; b < n-2  ;b++){
        if(N[b]<=N[b+1] && N[b+1]<=N[b+2]){
            ans++;
        }
      if(N[b+2]<=N[b+1] && N[b+1]<=N[b]){
          ans++;
       // printf("%d", ans);
    }
     
    }
     printf("%d", ans);
    return 0;
}