20 stamps/page * 5 pages. You got 100 stamps in total.
Background: With this new 2019 stamp, the Postal Service celebrates the American flag, the most recognizable symbol of our nation. The stamp features a U.S. flag, one of several on the flagpoles near the end of Chicago's Navy Pier, waving in a May breeze. The photograph was taken by art director Antonio Alcalá.