Skynet simple calculator

print("Hi there, my name is Holly, I'm a maths bot")
users_name = input("Might I ask your name? ")
print("Welcome, " + users_name)
print("I can calculate the area of a pizza and work out how many people it will feed")
print("I know that the average person needs about 113 square inches of pizza") # i.e. 1 x 12" pizza
pizza1 = input("How big is your pizza, in inches: ")
size1 = int(pizza1)
area = ((size1/2)**2)*3.14159
areastr = str(area)
numberofpeople = area/113
numberofpeoplestr = str(numberofpeople)


print("The area is " + areastr +" square inches")
print("This pizza will feed " + numberofpeoplestr +" people")
print("but tomorrow you\'ll need to go for a run!")