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#include <bits/stdc++.h>
using namespace std;
int N, fup, uppre,downpre,fdown, curr, pre;
int limity[2]={-1000000,1000000};
bool zamianaup,zamianadown;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> N;
    cin >> curr;
    for (int i = 1; i < N; i++)
    {
        pre = curr;
        uppre=pre;
        downpre=pre;
        if(zamianaup)
            uppre=limity[(i+1)%2];
        if(zamianadown)
            downpre=limity[i%2];
        zamianaup=false;
        zamianadown=false;
        cin >> curr;
        if(i%2)
        {
            if(curr <=uppre)
            {
                zamianaup=true;
                fup++;
            }
            if(curr >= downpre)
            {
                zamianadown=true;
                fdown++;
            }
        }
        else
        {
            if(curr >= uppre)
            {
                zamianaup=true;
                fup++;
            }
            if(curr <= downpre)
            {
                zamianadown=true;
                fdown++;
            }
        }
    }
    cout << min(fup,fdown)<< "\n";
}