begin
var x:=ReadReal();
if(x<=-4) then
print(0)
else if((x>-4) and (x<=6)) then
print(sin(x)**2)
else if((x>=6) and (x<=20)) then
print(x**(1/3))
else if(x>20) then print((sin(x)**2)/2);
end.
begin
var x := ReadReal('x=');
var y: real;
if x <= -4 then
y := 0
else if x <= 6 then
y := Sqr(Sin(x))
else if x <= 20 then
y := x ** (1 / 3)
else
y := Sqr(Sin(x)) / 2;
Println(y);
end.
x= 19.8
2.70533922899524
