ls=[8, 12, 12, 16, 18, 18, 20, 20, 24, 27, 28, 30, 30, 40, 42, 44, 45, 50,
 56, 63, 66, 70, 88, 99, 110, 248, 372, 528, 620, 792, 868, 1056,
 1188, 1320, 1364, 16368]
cnt=0
n=int(input())

for i in range(len(ls)):
    if n==ls[i]:
        cnt+=1

if cnt==0:
    print(0.00000000000000000)
elif cnt==1:
    print(1/36)
elif cnt==2:
    print(1/18)