4.1

from math import sqrt


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


def get_s(x1, y1, x2, y2):
    return sqrt(get_argument(y1, y2) + get_argument(x1, x2)) * centersDistance


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


def check_line(x1, y1, x2, y2):
    if (lightX - x1) * (y2 - y1) == (x2 - x1) * (lightY - y1):
        return True
    return False


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

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

for item in inputData:
    itemX = item[0]
    itemY = item[1]
    itemS = get_s(lightX, lightY, itemX, itemY) + d / 2
    itemShadow = get_shadow(item[2], itemS)
    for potential in inputData:
        if item != potential:
            pX = potential[0]
            pY = potential[1]
            if check_line(itemX, itemY, pX, pY):
                pS = get_s(lightX, lightY, pX, pY) + d / 2
                if itemS < pS:
                    if itemShadow > get_s(itemX, itemY, pX, pY) - d:
                        res += 1

print(res)