program bt;
uses crt;
var n,i: integer;
begin
clrscr;
write('nhap so n vao day '); read(n);
for i:= 1 to n do i mod 2;
if i mod 2 = 0 then write(i);
readln
end.
var n,i:integer;
begin
write('n=');readln(n);
for i:=1 to n do
if i mod 2=0 then write(i,' ');
readln;
end.