var x,y: integer;
var min,max: Real;
var Z: real;
var step: Real;
begin
writeln('Введите x: ');
readln(x);
writeln('Введите y: ');
readln(y);
if x<=0 then
begin
max:= x+y;
if max<((x*y)/2) then
begin
max:= (x*y)/2;
writeln('Max: ', max);
end;
else
begin
for i:=1 to 0.5 do step:=step*(x*0.5);
min:= step;
if(min > (x+y)/2) then
min:= (x+y)/2;
writeln('Min: ', min);
end;
end;
end.
var
t:boolean;
d:integer;
begin
t := true;
d := 2;
while t and (d*d <= x) do
begin
if x mod d = 0 then
t := false;
d := d + 1
end;
prime := t
end;
function order(x:integer):boolean;
var
t:boolean;
d:integer;
begin
d := -1;
repeat
t := x mod 10 > d;
d := x mod 10;
x := x div 10
until not t or (x = 0);
order := t
end;
var
t:boolean;
i,k,n:integer;
begin
t := false;
read(k,n);
for i := k to n do
if prime(i) then
if order(i) then
begin
write(i,' ');
t := true
end;
if not t then
write(0)
end.