information technology develop increasingly penetrate sphere human activity incredible modern technology farmingA large farm meadow grazing sheep Overall n sheep contain unique number 1 n sheep need distinguished need remember information alike the meadow consist infinite number region number 1 infinity its know sheep like region li riThere shepherd take care sheep First Second First wake early morning lead sheep graze lawn Second come evening collect sheepone morning First wake little later usual time lead sheep graze lawn so tie sheep region like First think well second work evening sheep will not scatter tie otherin evening Second come lawn gather sheep try line row but try sheep would not line second want second strength ability untie sheep leave condition want line sheep maximum distance tie sheep small possible the distance sheep number sheep rank twohelp second find right arrangement