Table schema:
CREATE TABLE table_name_51 (high_estimate INTEGER, low_estimate VARCHAR, type VARCHAR, location VARCHAR)

Question: With a type of mass suicide located in France and a low estimate greater than 16, the sum of the high estimate numbers listed is what number?
SQL: SELECT SUM(high_estimate) FROM table_name_51 WHERE type = "mass suicide" AND location = "france" AND low_estimate > 16