# Task No. 7.1

## Condition:

On the Misty Planet, santiks, kubriks, and tugriks are in circulation. One santik can be exchanged for 1 kubrik or 1 tugrik, 1 kubrik can be exchanged for 3 santiks, and 1 tugrik can be exchanged for 4 santiks. No other exchanges are allowed. Jolly U, initially having 1 santik, made 20 exchanges, and now he has 25 santiks (and no other money). How many times did he exchange kubriks for santiks?