class UserList(list):
    def __getitem__(self, item):
        if item < 0 or item > len(self):
            return 0
        return super(UserList, self).__getitem__(item)


m, n = map(int, input().split())
a = [UserList([0] * 8) for h in range(8)]
a[n - 1][m - 1] = 1
for i in range(n, 8):
    for j in range(8):
        if 0 < j < 7:
            a[i][j] = a[i - 1][j - 1] + a[i - 1][j + 1]
print(sum(a[-1]))