#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
  }
  vector<int> p;
  p.push_back(-1);
  for (int i = 0; i < N - 1; i++){
    if (A[i] < A[i + 1]){
      p.push_back(i);
    }
  }
  p.push_back(N - 1);
  int cnt = p.size() - 1;
  int ans = 0;
  for (int i = 0; i < cnt; i++){
    ans += (p[i + 1] - p[i] + 1) / 2;
  }
  cout << ans << endl;
}