#------------------------------------------------------------------------------
#  TurtleLoop2.py
#------------------------------------------------------------------------------

import turtle

n = int(input('Enter the number of sides: '))
wn = turtle.Screen()      # Set up the window and its attributes
wn.bgcolor("lightgreen")
wn.title(str(n)+"-gon")

bob = turtle.Turtle()     # Create bob the turtle to draw things
bob.color("blue")         # pen color
bob.pensize(2)

for i in range(n):
   bob.forward(840/n)
   bob.left(360/n)

wn.mainloop()