Interior angle sum generator - Printable Version

Code:
import sys
#creates a main menu
def menu():
    #writes a welcome message
    print "Welcome to my interior angle sum generator!"
    raw_input('Press any key to continue...')
    #Asks for an input to make a selection
    x = raw_input('Enter 1 for a single value \nEnter 2 for a list of values: ')
    #if the input is equal to 1 it will call the first option
    if int(x) == 1:
        individual()
    #if the input is 2 it will call the second option
    elif int(x) == 2:
        array()
    #If a number other than 1 or 2 is entered it will give an error
    else:
        print "Please enter a valid number!"
def menu2():
	x = raw_input('---------------------------\nEnter 1 for a single value \nEnter 2 for a list of values\nEnter 3 to exit: ')
    #if the input is equal to 1 it will call the first option
	if int(x) == 1:
		individual()
    #if the input is 2 it will call the second option
	elif int(x) == 2:
		array()
    #If a number other than 1 or 2 is entered it will give an error
	elif int(x) == 3:
		sys.exit('Thank you for using Int Sum Generator by Ryan Shtirmer!')
	else:
		print "Please enter a valid number!"
#creates a function for one polygon with the given number of sides
def individual():
    #asks for an input of the number of sides
    n = raw_input('Number of sides: ')
    #Checks if the input is less than 3
    if int(n) < 3:
        print "Please enter a number above 3!"
        individual()
    #Runs and displays the formula
    if n >= 3:
        x = int(n)-2
        print x * 180
        raw_input('Press any key to continue...')
    else:
    	individual()
	menu2()
#Creates a function to make a list of angles sums between 3 and the inputted number
def array():
    #number of sides is 3
    n=3
    #Asks for the highest number of sides
    z = raw_input('Highest Number of sides: ')
    #Checks if the number is less than 4 or greater than 500
    if int(z) < 4:
        print "Please enter a number greater than 3!"
        array()
    if int(z) > 500:
        print "Please enter a number less than 500!"
        array()
    #Runs the formula on all numbers between 3 and the given number
    if int(z) >= 4 and int(z) <=500:
        while n<int(z):
            x=n-2
            print str(n) + ":" + str(x * 180)
            n+=1
        raw_input('Press any key to continue...')
        menu2()
    else:
    	array()
menu()