题目本身没有难度，注意坐标是实数点，强转的时候要用float

import math

n = int(input())
time = 0
for _ in range(n):
    x, y, num = map(float, input().split())
    distance = math.sqrt(x ** 2 + y ** 2)
    time += (1 + 0.5) * num + (distance / 50) * 2
print(math.ceil(time))