# -3  -6  //2   86 -> 53 -> !36 -> 12

def f(st, fin):
    if st == fin:
        return 1
    if st < fin or st == 36:
        return 0
    return f(st-3, fin) + f(st-6, fin) + f(st//2, fin)

res = f(86, 53) * f(53, 12)
print(res)  # 144