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#include <bits/stdc++.h>
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

//Jakub Misiaszek
//szablon czesciowo skopiowany z profilu https://codeforces.com/profile/Geothermal
using namespace std;
 
typedef long long LL;
typedef long double LD;
 
typedef pair<int, int> pii;
typedef pair<LL,LL> pll;
typedef pair<LD,LD> pdd;
 
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<LD> vld;
typedef vector<LL> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
 
template<class T> using pq = priority_queue<T>;
template<class T> using pqg = priority_queue<T, vector<T>, greater<T>>;
 
#define rep(i, a, b) for (int i=a; i<(b); i++)
#define repd(i,a,b) for (int i = (a); i >= b; i--)
#define sz(x) (int)(x).size()
#define pb push_back
#define st first
#define nd second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define memo(x) memset(x, 0, sizeof(x))
#define debug(x) cerr << x << " "
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
LL losuj(LL a, LL b){ return a+rng()%(b-a+1);}

void solve(){
	int n; cin >> n;
	vi t(n,0);
	for(int i = 0; i < n; i++) cin >> t[i];

	int ans1 = 0, ans2 = 0;

	for(int i = 1; i < n; i++){
		if(i&1){
			if(t[i] <= t[i-1]){
				ans1++;
				i++;
			}
		}
		else{
			if(t[i] >= t[i-1]){
				ans1++;
				i++;
			}
		}
	}

	for(int i = 1; i < n; i++){
		if(i&1){
			if(t[i] >= t[i-1]){
				ans2++;
				i++;
			}
		}
		else{
			if(t[i] <= t[i-1]){
				ans2++;
				i++;
			}
		}
	}

	cout << min(ans1, ans2) << "\n";
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int t = 1;
	//cin >> t;
	while (t--) solve();
	
	return 0;
}