Why the memoir? Well, the author of the scheduled article became unwell. (He should be up and running soon, and his article will appear at some later time.) Facing the prospect of missing an issue, I thought about what I can do in a few days before the deadline. It occurred to me that 2016 is the 50th anniversary of the 1966 International Congress of Mathematicians. Maybe the impressions of a young Soviet mathematician would be of interest to at least some of the readers.