n=int(input())
if 3<= n <=6:
    s=5*3*5
elif 7<= n <=10:
    s=15*3*5
elif n > 10 :
    s=25*3*5

if s % 120==0 :
    print(s//120)
else:
        print(s//120+1) 
/**************************************************************
	Problem: 1310
	User: admin
	Language: Python
	Result: Accepted
	Time:132 ms
	Memory:34480 kb
****************************************************************/