What is the sum of the population in millions that has an influence less than 2.91, a MEP smaller than 13, a member of Latvia, and more than 286,875 inhabitants per MEP?
CREATE TABLE "nice_system" (
  "member_state" text,
  "population_millions" real,
  "me_ps" real,
  "inhabitants_per_mep" real,
  "influence" real
);
SELECT SUM("population_millions") FROM "nice_system" WHERE "influence"<2.91 AND "me_ps"<13 AND "member_state"='latvia' AND "inhabitants_per_mep">'286,875';