T(python)

n, m = map(int, input().split())
dp = [];
for i in range(n + 2):
    dp.append([0]*(m + 2))
dp[2][2] = 1
for i in range(2, n + 2):
    for j in range(2, m + 2):
        if i != 2 or j != 2:
            dp[i][j] = dp[i-2][j-1] + dp[i-1][j - 2]
print(dp[n + 1][m + 1])