As many as you can.
The cost of one online session is 3,447
rubles (remember that this is not only payment for the direct work of a specialist). The full calculation estimate is here (link to the table
If you donate 500 rubles per month, then 7 people like you will be able to pay for 1 session per month, and 28 people like you can pay for 4 sessions per month.
If 28 people donate 500 rubles each for three months, then here is a ready opportunity to help!
In general, we suggest donating 500+ rubles per month, but any amount is a big contribution.