( X 10) + ( X 1) = 19 roubles
( X 10) + ( X 1) = 27 roubles
( X 10) + ( X 1) = 30 roubles
( X 10) + ( X 1) = 45 roubles
( X 10) + ( X 1) = 53 roubles
( X 10) + ( X 1) = 61 roubles