I wasn't able to find a definitive answer, but after skimming Wikipedia I think a reasonable range would be at least 3 but probably less than 17.
https://en.m.wikipedia.org/wiki/Bird_intelligence
Anecdotal evidence from the 1960s has suggested that crows can count up to 3. It has been shown that parrots can count up to 17.
rape survivors are going to have a hard time...