How to parse the original 1080x607 banner image in the Odnoklassniki feed?

Question

Parsing

Good afternoon, there was a need to download the original banner size 1080x607.
In the classmates feed, a ready-made link to an image of 548x308 px is formed,
Example: https://r.mradx.net/img/B4/CAAA42.jpg


I am sure that it is possible to either make classmates use a large image or find a link to the original image.
Interested in images loaded from this domain: r.mradx.net