# def say_hi():
#   return "Hi"
# greeting = say_hi() #the returned value from say_hi function gets assigned to the 'greeting' variable
# print greeting # this will output 'Hi'

def add(a, b):
  x = a + b
  return x
sum1 = add(4,6)
sum2 = add(1,4)
sum3 = sum1 + sum2
print sum3