import turtle

def drawing():
    window = turtle.Screen()
    window.bgcolor("yellow")
    board = turtle.Turtle()
    board.forward(a)
    board.left(120)
    board.forward(b)
    board.left(120)
    board.forward(c)
    window.exitonclick()

a = int(input("Zadejte stranu A:"))
b = int(input("Zadejte stranu B:"))
c = int(input("Zadejte stranu C:"))

if (a + b) < c:
    valid = False
elif (a + c) < b:
    valid = False
elif (b + c) < a:
    valid = False
else:
    valid = True

if valid == True:
    if (a > 250) or (b > 250) or (c > 250):
        a = a / 16
        b = b / 16
        c = c / 16
    elif (a < 10) or (b < 10) or (c < 10):
        a = a * 16
        b = b * 16
        c = c * 16
    drawing()
else:
    print("Trojúhelník nelze sestrojit.")