revers

program revers;
 function revers(ch:word):word;
 begin
  revers:=10*(revers +ch mod 10);
  if ch>9 then
   revers:= revers(ch div 10,new)
  else revers:=new div 10;
end;
 var ch:integer;
 begin
  readln(ch);
  writeln(revers(ch,0));
end.