taRea=EJercIcIOs

ej 120
# paRes
for b in range(0,200):
if (a/2)*2==a:
print a

ej121
#pares inverso
for a in range (200,1,-1):
if (a/2)*2==a:
print a

ej122
# numeros pares
u=int (raw_input('ing un valor'))
for a in range (u,1,-1):
if (a/2)*2==a
print a