The following data describe the results of an experiment testing whether experience running mazes influences how quickly laboratory mice completed a new maze. Experienced mice had previous run different mazes, whereas novice mice had never been in an experimental maze before. Use this data to answer the following questions.

fast slow did not complete

novice $5043164$

experienced $1207995$

$1.$ What is the total sample size for this experiment? Enter your answer as an integer.