def main():
    s = [2,3,5,7,11,13]
    g = [4,6,8,9,10,12]

    K = int(input())
    boolean = False
    for e in s:
        if K % e == 0:
            val = K / e
            if val in g:
                print(1/36)
                boolean = True

    if not boolean:
        print(0)

if __name__ == '__main__':
    main()