dice1=[2,3,5,7,11,13]
dice2=[4,6,8,9,10,12]
kazoeru = []
for i in range(201):
    kazoeru.append(0)
for c1 in dice1:
    for c2 in dice2:
        kazoeru[c1*c2]+=1
K = int(input())
print(kazoeru[K]/36)