Note:Your choice is C IDE */
#include "stdio.h"
int main()
{
int n,a[10000]={0},i,b[10000]={0},j,k;
scanf("%d",&n);
for (i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
for (i=1;i<n;i++)
{
if (a[i]-a[i-1]==0) b[i]=b[i-1];
if (a[i]-a[i-1]>0) b[i]=1;
if (a[i]-a[i-1]<0) b[i]=-1;
}
for (i=2;i<n;i++)
if (b[i-1]==-1&&b[i]==1) k++;
printf("%d",k);
return 0;
}
