# Author: James Tam
# Version: October 24, 2013
#
# A common mistake: assuming that this program is 'hanging' because of
# an endless loop and then focusing all of one's energy on trying to debug
# that part of the program. (If you don't spot the bug then here's a hint: 
# this program is extremely un-user friendly, "What am I supposed to do?"


MIN = 0
MAX = 114
HUMAN_CAT_RATIO = 7

age = int(input())
while ((age < MIN) or (age > MAX)):
    age = int(input())
age = age / HUMAN_CAT_RATIO
print("Your age if you were a cat %0.0f" %(age))