import sys
import pdg
api = pdg.connect()
partid = int(sys.argv[1])
part = api.get_particle_by_mcid(partid)
# vars(pi_minus)


if len(list(part.lifetimes())) == 0 :
            sys.exit(12)
else :
            print('%.5e' % (list(part.lifetimes())[0].value ))