Oh My friend.
Nice to see you again online.
About The Problem 1113
It's a math problem ,I think.
But I can't slove it out.

In my opinion it want us to do this.

You have a jeep.
It can take M litres itself and must travel for N kilometters.
M<N
But it can drop fuel to anywhere it want.Then it can turn back and
make it oil box full with fuel.
When it came back .
It can pick the fuel up which it left there before.
I this way.It can tralver longer than M kilometters.

The task is find out the the minimum liters of fuel it spend to
travel N kilometters.

Do you understand ?
If you or anyone work it out .
Please tell me the method .OK