#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <vector>

using namespace std;

int n;
int a[25];

int panic(){
   for (int i = 1; i < 10; ++i)
      if (a[i] >= a[i+1])
         return 0;
   for (int i = 10; i <= 18; ++i)
      if (a[i] <= a[i+1])
         return 0;
   return 1;
}

int main()
{
  // freopen("da.in", "r", stdin);
  // freopen("da.out", "w", stdout);
   scanf("%d", &n);
   if (n < 19){
      printf("0");
      return 0;
   }
   int nr = 0;
   for (int i = 1; i <= 18; ++i)
      scanf("%d", &a[i]);
   for (int i = 3; i <= n; ++i){
      scanf("%d", &a[19]);
      if (panic())
         nr++;
      for (int i = 1; i <= 18; ++i)
         a[i] = a[i+1];
   }
   printf("%d", nr);

   return 0;
}