import turtle

LARG = 800
ALT = 600

turtle.setup(LARG, ALT)

def f(x: int) -> int:
    return -(3/800)*(x**2)+300

turtle.up()
ini_x = -LARG//2
ini_y = f(ini_x)
turtle.goto(ini_x, round(ini_y))
turtle.down()

for x in range(1-LARG//2, -1+LARG//2):
    y = f(x)
    turtle.goto(x, round(y))

turtle.done()