def number(bus_stops):
# Good Luck!
number_of_passengers = 0
for i in bus_stops:
number_of_passengers += i[0]
number_of_passengers -= i[1]
return number_of_passengers
def number(bus_stops):
# Good Luck!
number_of_passengers = 0
for i in bus_stops:
number_of_passengers += i[0]
number_of_passengers -= i[1]
return number_of_passengers