#include <iostream>

using namespace std;

int main()
{
    long long n, a, b, sol = 0;
    bool inc = false;;

    cin >> n;
    cin >> a;
    for (long long i = 0; i < n-1; ++i) {
        cin >> b;
        if (a < b && !inc) {
            inc = true;
            ++sol;
        } else if (a > b && inc) {
            inc = false;
        }
        a = b;
    }

    cout << sol << endl;
    return 0;
}