from operator import mul
N = int(input())
a = [2,3,5,7,11,13]
b = [4,6,8,9,10,12]
m = [[0]*6]*6
c = 0
for i in range(6):
	m[i] = list(map(mul,a,[b[i]]*6))
for i in m:
	c += i.count(N)
print(c/36)