Here, angle MBC = angle MCB, because MBC is an isosceles triangle,

So, tan MCB = AB / BC

MCB = tan inverse MCB

MBC = MCB (isosceles triangle)

import math

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

tan_MCB = AB / BC

MCB = math.degrees(math.atan(tan_MCB))

MBC = MCB # because MBC == MCB (isosceles triangles)

print(f"{round(MBC)}\u00B0")