How many photos were used to synthesize the largest cosmic galaxy cluster map ever taken by Hubble Space Telescope?

The Hubble Space Telescope's largest map of the universe galaxy cluster in history was synthesized from the photos taken by 78 Zhang Xianjin observation camera in the constellation of Celestial Furnace. The integration process is like completing a huge jigsaw puzzle. This achievement is part of a galaxy observation project called "Evolution Morphology and Spectral Energy Distribution of Galaxies", which was jointly completed by scientists from the United States, Germany and other countries.