Where is the ruble? ...

Imagine ...
I took 10 rubles from thee.
I went to the store and lost them.
Met a friend.
He took 5 rubles from him.
I bought 2 cigarettes for 1 rub.
I have 3 rubles left.
I gave them to you.
And should stay 7.
And a friend 5.
Total 12.
Plus I have 2 cigarettes.
Total 14.
Where is the ruble? !!