from math import *

T = int(input())

rad_to_deg = lambda rad: rad * 180 / pi

degs = list(range(0, 360, 60))

for _ in range(T):
    input()
    x, y = map(float, input().split())
    rad = atan2(y, x)
    deg = rad_to_deg(rad)
    goal = deg // 60
    res = deg - goal * 60
    if 0 < res and res <= 50:
        print(res)
    else:
        print(0)
    for _ in range(5):
        input()