C++ :

#include<iostream>
#include<algorithm>
using namespace std;
int n,s,a[100008];
int main()
{
	cin>>n;
	for (int i=1;i<=n;i++)
		cin>>a[i];
	for (int i=2;i<n;i++)
	if (a[i]>a[i-1]&&a[i]>a[i+1]) s++;
	cout<<s<<endl;
	return 0;
}