\[\boxed{\mathbf{579}.\ }\]
\[101 \rightarrow ост.\ 1;\]
\[118 \rightarrow ост.\ 18;\]
\[256 \rightarrow ост.\ 56;\]
\[508 \rightarrow ост.\ 8;\]
\[1957 \rightarrow ост.\ 7.\]