H TAP 2017

#include <bits/stdc++.h>
using namespace std;
#define dprint(v) cerr << #v"=" << v << endl //;)
#define forr(i,a,b) for(int i=(a); i<(b); i++)
#define forn(i,n) forr(i,0,n)
#define dforn(i,n) for(int i=n-1; i>=0; i--)
#define forall(it,v) for(auto it=v.begin();it!=v.end();++it)
#define sz(c) ((int)c.size())
#define zero(v) memset(v, 0, sizeof(v))
#define pb push_back
#define fst first
#define snd second
typedef long long ll;
typedef pair<int,int> ii;

const int MAXN=100100;
int n,v[MAXN],m;

int main() {
    //~ freopen("in", "r", stdin);
    ios::sync_with_stdio(0);
    while(cin >> n){
        v[0]=0;
        m = 1;
        forn(i,n) { int a; cin >> a;
            if (a != v[m-1]) {
                v[m++] = a;
            }
        }
        int ans = 0;
        v[m] = 0;
        forr(i,1,m) {
            if (v[i-1]<v[i] && v[i]>v[i+1]) ans++;
        }

        cout << ans << endl;
    }
    return 0;
}