b=int(input())
c=int(input())
import turtle
t=turtle.Turtle()
a=turtle.Turtle()
t.speed(0)
t.goto(0,0)
a.speed(0)
a.penup()
a.goto(200,0)
a.pendown()
t.left(90)
d=0
e=0
f=0
while 1:
    for i in range(b):#for循环结构,range()函数，迭代器，list,tuple...
        t.pencolor("black")
        t.forward(c)
        t.left(360/b)
        a.pencolor("black")
        a.forward(c)
        a.left(360/b)
    for i in range(b):#for循环结构,range()函数，迭代器，list,tuple...
        t.pencolor("white")
        t.forward(c)
        t.left(360/b)
        a.pencolor("white")
        a.forward(c)
        a.left(360/b)
    a.backward(20)
turtle.down()