{

//freopen("in.txt","r",stdin);
int n;
while(~scanf("%d",&n))
{
    for(int i=0;i<n;++i) scanf("%d",a+i);

    ll ans=0;

    for(int i=1;i<n-1;++i) if(a[i]>a[i-1]&&a[i]>a[i+1]) ++ans;