from math import sqrt, cos, acos, asin, sin, degrees

ab = float(input())
bc = float(input())

# Pythagoras theorem
ac = sqrt(ab**2 + bc**2)
mc = ac/2

# definition of cos and sin, delta is angle ACB
cos_delta = bc/ac
sin_delta = ab/ac

# law of cosines to find mb
mb = sqrt(bc**2 + mc**2 - 2*bc*mc*cos_delta)

# law of sines to find sin_theta
sin_theta = (mc*sin_delta)/mb

print(f"{round(degrees(asin(sin_theta)))}\N{DEGREE SIGN}")

import math
AB = int(input())
BC = int(input())
angle = math.atan(AB/BC)
print(f"{round(math.degrees(angle))}\u00b0")

from math import degrees, atan

AB = int(input())
BC = int(input())

print(f"{round(degrees(atan(AB/BC)))}\u00B0")

import math

ab = int(input())
bc = int(input())

theta = round(math.degrees(math.atan(ab/bc)))

print(f"{theta}\u00B0")