#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ld long double

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

	int cnt = 0;
	for (int i = 0; i < n - 1; ++i)
		if (a[i] < a[i + 1])
			++cnt;

	cout << cnt << endl;

	return 0;
}
