using namespace std;
struct Treugolnik
{
int x1, y1;
int x2, y2;
int x3, y3;
};
int main()
{
Treugolnik a1;
cin >> a1.x1;
cin >> a1.x2;
cin >> a1.x3;
cin >> a1.y1;
cin >> a1.y2;
cin >> a1.y3;
float S, P, h,p;
P = sqrt(pow(a1.x2 - a1.x1, 2) + pow(a1.y2 - a1.y1, 2))+sqrt(pow(a1.x3 - a1.x2, 2) + pow(a1.y3 - a1.y2, 2))+ sqrt(pow(a1.x3 - a1.x1, 2) + pow(a1.y3 - a1.y1, 2));
p = 0.5*(sqrt(pow(a1.x2 - a1.x1, 2) + pow(a1.y2 - a1.y1, 2)) + sqrt(pow(a1.x3 - a1.x2, 2) + pow(a1.y3 - a1.y2, 2)) + sqrt(pow(a1.x3 - a1.x1, 2) + pow(a1.y3 - a1.y1, 2)));
S = sqrt(p*(p - sqrt(pow(a1.x2 - a1.x1, 2) + pow(a1.y2 - a1.y1, 2*(p - sqrt(pow(a1.x3 - a1.x2, 2) + pow(a1.y3 - a1.y2, 2)))*(p - sqrt(pow(a1.x3 - a1.x1, 2) + pow(a1.y3 - a1.y1, 2)));
h = 2 * S / sqrt(pow(a1.x2 - a1.x1, 2) + pow(a1.y2 - a1.y1, 2)); только к одной стороне
if (sqrt(pow(a1.x2 - a1.x1, 2) + pow(a1.y2 - a1.y1, 2)) == sqrt(pow(a1.x3 - a1.x2, 2) + pow(a1.y3 - a1.y2, 2)) == sqrt(pow(a1.x3 - a1.x1, 2) + pow(a1.y3 - a1.y1, 2)))
cout << "ранвостронний";
if (pow(sqrt(pow(a1.x2 - a1.x1, 2) + pow(a1.y2 - a1.y1, 2)), 2)+pow(sqrt(pow(a1.x3 - a1.x2, 2) + pow(a1.y3 - a1.y2, 2)),2)==pow(sqrt(pow(a1.x3 - a1.x1, 2) + pow(a1.y3 - a1.y1, 2)),2));
cout << "прямоугольный";
cout << S;
cout << h;
cout << P;
return 0;
}
var a: array [1..N] of integer;
i, j, k: integer;
begin
for i:=1 to N do
readln(a[i]);
k:=0;
if A[1]<A[2] then k:=k+1;
if A[N]<A[N-1] then k:=k+1;
For i:= 2 to N-1 do
if (A[i]<A[i-1])and(A[i]<A[i+1]) then k:=k+1;
WriteLn(k);
end.