When Jake is not busy he will get 12 hours of sleep. Unfortunately, Jake has a lot of stuff to do on a given night. When he hangs out with friends he loses 2 hours of sleep. When he does college applications, he loses 3 hours of sleep. When he writes codingbat problems, he loses 7 hours of sleep. When he studies for tests, he loses 4 hours of sleep. Because he is not a time traveller, Jake cannot get negative sleep. The least amount of sleep he can get is 0 hours. Return the number of hours that Jake slept last night.