def solve():
    N=int(input())
    M=int(input())

    if N<M:
        return 0
    X=[[1],
        [0,1],
        [0,1,2],
        [0,1,6,6],
        [0,1,14,36,24],
        [0,1,30,150,240,120],
        [0,1,62,540,1560,1800,720],
        [0, 1, 126, 1806, 8400, 16800, 15120, 5040],
        [0, 1, 254, 5796, 40824, 126000, 191520, 141120, 40320],
        [0, 1, 510, 18150, 186480, 834120, 1905120, 2328480, 1451520, 362880],
        [0, 1, 1022, 55980, 818520, 5103000, 16435440, 29635200, 30240000, 16329600, 3628800],
        [0, 1, 2046, 171006, 3498000, 29607600, 129230640, 322494480, 479001600, 419126400, 199584000, 39916800],
        [0, 1, 4094, 519156, 14676024, 165528000, 953029440, 3162075840, 6411968640, 8083152000, 6187104000, 2634508800, 479001600],
        [0, 1, 8190, 1569750, 60780720, 901020120, 6711344640, 28805736960, 76592355840, 130456085760, 142702560000, 97037740800, 37362124800, 6227020800],
        [0, 1, 16382, 4733820, 249401880, 4809004200, 45674188560, 248619571200, 843184742400, 1863435974400, 2731586457600, 2637143308800, 1612798387200, 566658892800, 87178291200],
        [0, 1, 32766, 14250606, 1016542800, 25292030400, 302899156560, 2060056318320, 8734434508800, 24359586451200, 45950224320000, 59056027430400, 50999300352000, 28332944640000, 9153720576000, 1307674368000]]

    return X[N][M]

#==================================================
print(solve())