Ms. Scagnetti tried very hard to make sure that nobody was left out during dance class. She thought she had a correct head count, so she told them to pair up. This didn’t work because there was one person left out. She then told them to get into groups of five, but this didn’t work either because again there was one person left over. So she tried setting up groups of three, but unfortunately there was one left over. Finally, she decided to try groups of four. Again there was one person left out. There are less than 80 students in the dance class. How many were present on that particular day?