program sd;
uses crt;
var
a: integer;
s: string;
function sdf(a: string; n: integer): integer;
begin
if n >= 1 then
result := result + strtoint(a[n]) + sdf(a, n - 1);
end;
begin
read(s);
write(sdf(s, length(s)));
end.
program sd;
uses crt;
var
a: integer;
s: string;
function sdf(a: string; n: integer): integer;
begin
if n >= 1 then
result := result + strtoint(a[n]) + sdf(a, n - 1);
end;
begin
read(s);
write(sdf(s, length(s)));
end.