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#include <iostream>

using namespace std;
int n,a,b,x,y;
int inf=1e9;
int ile,ile2;
bool c;
int main()
{
    std::ios_base::sync_with_stdio(0);
    cin>>n>>b;
    y=b;
    for(int i=1;i<n;i++)
    {
        cin>>a;
        x=a;
        if(c&&a>=b)
        {
            ile++;
            a=inf*-1;
        }
        else if(!c&&a<=b)
        {
            ile++;
            a=inf;
        }
        if(c&&x<=y)
        {
            ile2++;
            x=inf;
        }
        else if(!c&&x>=y)
        {
            ile2++;
            x=inf*-1;
        }
        if(c)c=false;
        else c=true;
        b=a;
        y=x;
    }
    cout<<min(ile,ile2);
    return 0;
}