program CalculateFunction;
function F(x: Real): Real;
begin
if x < 0 then F := 0
else if x < 1 then F := x
else F := x * x * x * x;
end;
var
x: Real;
begin
Write('Введите x: '); ReadLn(x);
WriteLn('F(x) = ', F(x):0:2);
end.
{0 при x < 0;
{x при 0 < x<1;
{х^4 при x >_ 0.