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

    dice_sosuu = [
        2,
        3,
        5,
        7,
        11,
        13
    ]

    dice_gousei = [
        4,
        6,
        8,
        9,
        10,
        12
    ]

    cnt = 0
    for deme_gousei in dice_gousei:
        if k%deme_gousei != 0 or k <= deme_gousei:
            continue
        else:
            for deme_sosu in dice_sosuu:
                if k%(deme_gousei*deme_sosu) == 0:
                    cnt += 1
                    break

    print(cnt/36)
    
if __name__ == '__main__':
    main()