作业11

import turtle
number = int(input())      
turtle.screensize(600,500,'white')
turtle.pensize(3)          
turtle.pencolor('blue')    
turtle.fillcolor('yellow')  
turtle.begin_fill()         
turtle.forward(-50)
for i in range(3,number):
    turtle.circle(50, steps=i)
    turtle.forward(100)
turtle.circle(50, steps=number)
if number == 1:
    turtle.circle(50)
else:
    turtle.forward(100)
    turtle.circle(50)
turtle.end_fill()
turtle.hideturtle()        
turtle.done()