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//Agata Majewska 13.12.2022
#include <iostream>
//#include <string.h>
using namespace std;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
    int n,i,zm1=0,zm2=0;
    cin>>n;
    int tab[n];
    int t,pop1,pop2;
    bool p=1;
    cin>>pop1;
    pop2=pop1;
    //wmwmwmw -zm1  w na nieparzystych
    //mwmwmwm -zm2  w na parzystych
    for(i=1;i<n;i++){
        cin>>t;
        //cout<<"pop1 = "<<pop1<<"\npop2 = "<<pop2<<"\nt = "<<t<<"\nzm1 = "<<zm1<<"\nzm2 = "<<zm2<<"\n\n";
        if(i%2==0){
            if(t>pop2){
                //wszystko ok
                pop2 = t;
            }
            else{
                zm2++;
                pop2 = 1000001;
            }
            if(t<pop1){
                //wszystko ok
                pop1 = t;
            }
            else{
                zm1++;
                pop1 = -1000001;
            }
        }
        else{
            //i%2==1
            if(t>pop1){
                //wszystko ok
                pop1 = t;
            }
            else{
                zm1++;
                pop1 = 1000001;
            }
            if(t<pop2){
                //wszystko ok
                pop2 = t;
            }
            else{
                zm2++;
                pop2 = -1000001;
            }
        }
    }
    //cout<<"pop1 = "<<pop1<<"\npop2 = "<<pop2<<"\nt = "<<t<<"\nzm1 = "<<zm1<<"\nzm2 = "<<zm2<<"\n\n";
    if(zm1<zm2){
        cout<<zm1;
    }
    else{
        cout<<zm2;
    }

return 0;
}