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#include <iostream>
using namespace std;
int high = 1000000000, low = -1000000000;
int tab1[50009], out1=0;
int tab2[50009], out2=0;
int main()
{
    ios_base::sync_with_stdio(0);
    int cunt;
    cin >> cunt;
    cin >> tab1[0];
    tab2[0] = tab1[0];
    for (int i = 1; i < cunt; i++)
    {
        cin >> tab1[i];
        tab2[i] = tab1[i];
        if (i % 2 == 1)
        {
            if (tab1[i - 1] <= tab1[i])
            {
                tab1[i] = low;
                out1++;
            }
            if (tab2[i - 1] >= tab2[i])
            {
                tab2[i] = high;
                out2++;
            }
        }
        else
        {
            if (tab1[i - 1] >= tab1[i])
            {
                tab1[i] = high;
                out1++;
            }
            if (tab2[i - 1] <= tab2[i])
            {
                tab2[i] = low;
                out2++;
            }
        }
    }
    cout << min(out1, out2);
}