def f(a, b, m):
    if a + b >= 59:
        return m % 2 == 0
    if m == 0:
        return 0
    h = [f(a + 1, b, m-1), f(a * 2, b, m-1), f(a, b + 1, m-1), f(a, b * 2, m-1)]
https://tmearn.net/z91e