from turtle import *
import turtle as t

n = int(input())
speed(1)

lt(90)


def uno(n):
    f = n
    for i in range(n):
        f -= 1
        fd(f)
        if f != 0:
            rt(90 / n)
    for i in range(n):
        f += 1
        if f != 0:
            rt(90 / n)
        fd(f)
    if n > 2:
        rt(180)
        uno(int(n / 2))


uno(n)
t.mainloop()