nti_4.1

from math import sqrt


class Direction:
    def __init__(self, x, y):
        self.x = x - lightX
        self.y = y - lightY


def get_argument(value1, value2):
    return ((value1 - value2) * centersDistance) ** 2


def get_s(x, y):
    return sqrt(get_argument(lightY, y) + get_argument(lightX, x)) + d // 2


def get_shadow(q, s):
    return (lightHeight / (lightHeight - d * q)) * s - s


lightHeight = 50
d = 4
lightX = 4
lightY = 4
centersDistance = 5

n = int(input())
inputData = []
for i in range(0, n):
    itemData = eval(input())
    inputData.append(itemData)

sortedInputData = sorted(inputData)