#importing modules
import math
from __future__ import division
#Variable declaration
mpi=140; #mass of pi-meson
mp=938.3; #mass of proton
mk=498; #mass of k
m=1116;
#Calculation
Q=mpi+mp-mk-m; #Q-value(MeV)
#Result
print "Q-value is",round(Q),"MeV"
#importing modules
import math
from __future__ import division
#Variable declaration
mpc2=938.3; #energy of proton(MeV)
Epic2=139.6; #energy of pi-meson(MeV)
mnc2=939.6; #energy of neutron(MeV)
KE=0.6; #kinetic energy of neutron(MeV)
#Calculation
Epi=mpc2+Epic2-mnc2-KE; #energy conservation(MeV)
mpic2=math.sqrt((Epi**2)-((mnc2+KE)**2)+(mnc2**2)); #pi0 mass(MeV)
#Result
print "pi0 mass is",round(mpic2,1),"MeV"