A, B = map(int, input().split())

ans = 0
turn = 0
if A == B:
    print(A+B)
    exit()
while A > 0 and B > 0:
    if turn == 0:
        A -= 1
        turn = 1
    else:
        B -= 1
        turn = 0
    ans += 1

print(ans)