N, M = map(int, input().split())

counts = [[-1] * M for i in range(N)]
counts[0][0] = 1

def answer(i, j):
    if counts[i][j] >= 0:
        return counts[i][j]

    counts[i][j] = 0

    if i - 2 >= 0:
        if j - 1 >= 0:
            counts[i][j] += answer(i - 2, j - 1)
        if j + 1 <= M - 1:
            counts[i][j] += answer(i - 2, j + 1)

    if j - 2 >= 0:
        if i - 1 >= 0:
            counts[i][j] += answer(i - 1, j - 2)
        if i + 1 <= N - 1:
            counts[i][j] += answer(i + 1, j - 2)

    return counts[i][j]


print(answer(N - 1, M - 1))