from functools import lru_cache

p, c = map(int, input().split())

@lru_cache(None)
def dfs(i, x):
    if i == p + c:
        return x
        
    ret = 0
    if i < p:
        for a in [2, 3, 5, 7, 11, 13]:
            ret += dfs(i + 1, x * a / 6)
    else:
        for a in [4, 6, 8, 9, 10, 12]:
            ret += dfs(i + 1, x * a / 6)
    return ret
    
print(dfs(0, 1))