k = int(input())
prm = [2,3,5,7,11,13]
cmpstn = [4,6,8,9,10,12]

def find_pair(x):
    pairs = []
    for i in prm:
        for j in cmpstn:
            if i * j == x:
                pairs.append([i, j])
    return len(pairs)

print(find_pair(k) / 36)