'''
if - else usage me nested if

29/11/2021
Author: Errikos Ntinos
status:VERIFIED
'''

age=int(input('dose tin ilikia sou: '))
if age>=80 :
     print "den eisai ypoxreomenos na psifiseis pleon"
else:
    if age >= 18:
        print "mporeis na psyfiseis"
    else:
        print "eisai mikros akoma"