var i,n:integer;
begin
  i := 9;
  n := 1;
  while i > 0 do
    begin
      n :=  2 * (n + 1);
      i := i - 1;
    end;
    writeln(n);
    readln;
end.

/**************************************************************
	Problem: 1082
	User: admin
	Language: Pascal
	Result: Runtime Error
****************************************************************/