P,C = map(int,input().split())

sosu = [2,3,5,7,11,13]
gose = [4,6,8,9,10,12]

dic1 = {}
if P > 0:
    dic1[1] = 1

for i in range(P):
    next = {}
    for ind,val in dic1.items():
        for j in sosu:
            if ind*j in next:
                next[ind*j] += val/6
            else:
                next[ind*j] = val/6
    dic1 = next.copy()

dic2 = {}
if C > 0:
    dic2[1] = 1

for i in range(C):
    next = {}
    for ind,val in dic2.items():
        for j in gose:
            if ind*j in next:
                next[ind*j] += val/6
            else:
                next[ind*j] = val/6
    dic2 = next.copy()

ans = 0

if len(dic1) and len(dic2):
    for ind,val in dic1.items():
        for ind2,val2 in dic2.items():
            ans += ind*ind2*val*val2
            
elif len(dic1) and not len(dic2):
    for ind,val in dic1.items():
        ans += ind*val

elif not len(dic1) and len(dic2):
    for ind,val in dic2.items():
        ans += ind*val

print(ans)