#include <iostream>

using namespace std;

int main(){
	int count=0;
  int n;
  cin >> n;
  int a[n];

  for (int i = 0; i < n ; ++i)
    cin >> a[i];

  for (int i = 1; i < n; ++i){
      if (a[i]> a[i-1] )
       count ++;
    }
cout << count;
  return 0;
}