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#include<bits/stdc++.h>
using namespace std;

int n,x;
vector<int> mal;
vector<int> ros;
int wynM, wynR;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    cin >> x;
    mal.push_back(x);
    ros.push_back(x);
    for(int i=1; i<n; i++)
    {
        cin >> x;
        mal.push_back(x);
        ros.push_back(x);
        if(i%2)
        {
            if(x>=mal[i-1])
            {
                mal.pop_back();
                mal.push_back(-1e9);
                wynM++;
            }
            if(x<=ros[i-1])
            {
                ros.pop_back();
                ros.push_back(1e9);
                wynR++;
            }
        }
        else
        {
            if(x<=mal[i-1])
            {
                mal.pop_back();
                mal.push_back(1e9);
                wynM++;
            }
            if(x>=ros[i-1])
            {
                ros.pop_back();
                ros.push_back(-1e9);
                wynR++;
            }
        }
    }
    cout << min(wynM,wynR);
         return 0;
}