Read the passage below and solve the questions based on it.
During the census 2001, 8,000 people were surveyed in an extremely backward village, where most of the people were suffering from a certain number of diseases. In that village, 1,264 people were suffering from japanese fever and dehydration, 2,976 people were suffering from dehydration, 3,472 people from japanese fever and cholera, 4,720 people from cholera and 1,008 people from cholera and dehydration. 300 people suffered from all the three given diseases.
Find the number of persons who suffered from dehydration but not cholera.