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#include <iostream>
using namespace std;
int a, maxx, maxx2;
int main()
{
cin >> a;
long long int t[a];
long long int tab[a];
for (int i= 0; i < a; i++)
{

cin >> t[i];
tab[i] = t[i];
}
for (int i = 0; i < a - 1; i ++)
{
   if (i % 2 == 0)
   {
       if (t[i] > t[i + 1] )
       {
           maxx = maxx;
       }
       else
       {
           maxx = maxx + 1;
           t[i + 1] = t[i] - 10000000000;
       }
   }
   else if ( i % 2 == 1)
   {
        if (t[i] < t[i + 1] )
       {
           maxx = maxx;
       }
       else
       {
           maxx = maxx + 1;
           t[i + 1] = t[i] + 10000000000;
       }
   }
}
for (int i = 0; i < a - 1; i ++)
{
   if (i % 2 == 0)
   {
       if (tab[i] < tab[i + 1] )
       {
           maxx2 = maxx2;

       }
       else
       {
           maxx2 = maxx2 + 1;
           tab[i + 1] = tab[i] + 10000000;
       }
   }
   else if ( i % 1 == 0)
   {
        if (tab[i] > tab[i + 1] )
       {
           maxx2 = maxx2;

       }
       else
       {
           maxx2 = maxx2 + 1;
           tab[i + 1] = tab[i] - 1000000000;
       }
   }
}
if (maxx > maxx2)
{

    cout << maxx2;
}
else
{
    cout << maxx;
}

}