import sys


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


def main():
    K = int(input())

    A = [0, 0, 0, 0, 0, 0]
    for i in range(K):
        A = A[1:] + [sum(A)/6+1]

    print(A[-1])


if __name__ == '__main__':
    main()