var st :string;
k, i :integer;
begin
read (st);
for i := 1 to length (st) do begin
if st[i] = '0' then k := k + 1;
if st[i] = '6' then k := k + 1;
if st[i] = '8' then k := k + 2;
if st[i] = '9' then k := k + 1;
end;
write (k);
end.
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