[Request] Please, help me to identify a classical music theme used in two film scores

In the Forman’s Goya’s Ghosts i’ve heard a very short musical excerpt that sounds a bit familiar to me. I’m sure that’s not an original score, but music from classical repertory. Then, i find the same excerpt, with different orchestration, in a Schnittke’s film music, Sport Sport Sport (a Symphonic Suite arranged by Strobel). Unfortunately, it isn’t the original source of the musical theme because the entire track of Schnittke’s music is actually a typical potpourri � la Schnittke with quotations from russian (and not) famous composers.

Can you help me to identify the excerpt? This is the link (https://mega.nz/#F!Fp82iBJb!H3Nb2GaTy8HqzkIwxInb3w) of a folder hosted on mega.nz with three mp3 files:
1. Goya’s Ghosts.mp3 (fragment from the Forman’s movie)
2. Schnittke Fragment.mp3 (fragment from Schnittke’s music)
3. The Song of the Merchant Kalashnikov.mp3 (the entire track of Schnittke’s score for Sport Sport Sport).

Thank you in advance!