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#include <iostream>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int w = 0;
    int n;
    cin >> n;
    int t[n];
    for (int i = 0; i < n; i++)
    {
        cin >> t[i];
    }
    
    bool up = true;
    
    if (t[0] > t[1])
        up = false;
    int k = 0;
    int p = 0;
    int i = 1;
    while (i < n)
    {
        
        if ((up && t[i] >= t[i -1]) || (!up && t[i] <= t[i -1]))
        {
            if (t[i] == t[i-1])
            {
                p++;
                
            }
            k++;
            i++;
        }
        else
        {
            w += k/2 + p/2;
            
            k = 0;
            p = 0;
            up = !up;
        }
        
        
    }
    w += k/2+ p/2;

    cout << w;
    return 0;
}