#include <iostream>
#include <cmath>


using namespace std;

int main() {
    int n;
    cin >> n;
    int *a = new int [n];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int cnt = 0;
    for (int i = 1; i < n; i++) {
        if (a[i - 1] < a[i]) {
            cnt++;
        }
    }
    cout << cnt;
}