from math import *

A, B = map(int, input().split())
A, B = abs(A), abs(B)
ans = 0.25
if A == B == 0:
    print(ans)
elif A == 0 or B == 0:
    c = max(A, B)
    ans = 0
    for i in range(1, 30, c):
        ans += 1/((i + 1) ** (i + 1))
    print(ans)
else:
    g = gcd(A, B)
    ans = 0
    for i in range(30):
        for j in range(30):
            if i % g == j % g == 0:
                ans += 1/((i + j + 2) ** (i + j + 2))
    print(ans)