if __name__ == '__main__':
    k = int(input())
    p = 0
    lst1 = [2,3,5,7,11,13]
    lst2 = [4,6,8,9,10,12]
    for i in lst1:
        for j in lst2:
            if i * j == k:
                p += 1
    print(p/36)