import sys


def input(): return sys.stdin.readline().rstrip()


def main():

    def normal(a):
        b = [0]*(len(a)+6)
        for i in range(len(a)):
            for j in range(1, 7):
                b[i+j] += a[i] / 6
        return b

    def cheat(a):
        b = [0]*(len(a)+6)
        for i in range(len(a)):
            for j in range(4, 7):
                b[i+j] += a[i] / 3
        return b

    N = int(input())
    K = int(input())

    x = [1]
    for i in range(N):
        x = normal(x)
    y = [1]
    for i in range(K):
        y = cheat(y)

    for i in range(N-K):
        y = normal(y)

    ans = 0
    for i in range(len(x)):
        for j in range(i+1, len(y)):
            ans += x[i]*y[j]

    print(ans)


if __name__ == '__main__':
    main()