3) program n9;

var a,b,p:integer;

begin

a:=20;

b:=-12;

p:=a*b;

writeln(p);

end.

4) program b5;

var c,b: integer;

begin

readln(c);

begin

if c<0 then b:=0 else b:= c*2;

end;

writeln(b);

end.