#include<iostream>
#include<cstdio>
using namespace std;
int h[10086];
int main (){
    int n,ans=0;
    cin>>n;
    for (int i=1;i<=n;i++) {
        cin>>h[i];
        if (h[i-1]==h[i])
        i--;n--;
    }
    for (int i=1;i<=n;i++){
        if (h[i-1]>h[i]&&h[i]<h[i+1])
        ans++;
    }
    cout<<ans;
    return 0;
}
问
为神马全部超时？