p,c=map(int,input().split())
def dfs(cnt,now):
    if cnt==p+c:
        return now
    tmp=0
    if cnt<p:
        for i in [2,3,5,7,11,13]:
            tmp+=dfs(cnt+1,now*i/6)
    else:
        for j in [4,6,8,9,10,12]:
            tmp+=dfs(cnt+1,now*j/6)
    return tmp
print(dfs(0,1))