'''

ypologismos apolytis timis ari8mou

H apolyti einai PANTA 8etikos ari8mos H' miden

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

print "Ypologismos apolytis timis"
a=int(input('dose ena akeraio ari8mo: '))
if a<=0:
        a=(-1)*a
print a