m, n = map(int, input().split())
a = [[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]
        elif j:
            a[i][j] = a[i - 1][j - 1]
        else:
            a[i][j] = a[i - 1][j + 1]
print(sum(a[-1]))