a = int(input())
n = 0
if a > 10:
    m = 25 * 3 * 5
elif 7 <= a <= 10:
    m = 15 * 3 * 5
else:
    m = 5 * 3 * 5
n = m // 120
if m % 120 != 0:
    n += 1
print(n)
/**************************************************************
	Problem: 1310
	User: lzk
	Language: Python
	Result: Accepted
	Time:122 ms
	Memory:34480 kb
****************************************************************/