what is the number of smallpox when typhoid fever is 293
CREATE TABLE "incidence_of_disease_in_russian_empire_a" (
  "year" text,
  "typhus" real,
  "typhoid_fever" real,
  "relapsing_fever" real,
  "smallpox" real,
  "malaria" text
);
SELECT MAX("smallpox") FROM "incidence_of_disease_in_russian_empire_a" WHERE "typhoid_fever"=293;