import itertools
A,B = map(int,input().split())
AB = [0] * A + [1] * B

ans = 0
for x in itertools.permutations(AB):
    prev = x[0]
    p = 0
    for i in range(1,len(x)):
        s = x[i]
        if prev != s:
            p += 1
        prev = s
    
    ans = max(ans,p)
    
print(ans)