d = int(eval(input()))



if d == 25:

    print("Christmas")

elif d == 24:

    print("Christmas Eve")

elif d == 23:

    print("Christmas Eve Eve")

else:

    print("Christmas Eve Eve Eve")

    
D = eval(input())

if D == "25":

  print("Christmas")

elif D == "24":

  print("Christmas Eve")

elif D == "23":

  print("Christmas Eve Eve")

elif D == "22":

  print("Christmas Eve Eve Eve")
d = int(eval(input()))
if d == 25:
    print("Christmas")
elif d == 24:
    print("Christmas Eve")
elif d == 23:
    print("Christmas Eve Eve")
else:
    print("Christmas Eve Eve Eve")

D = eval(input())
if D == "25":
    print("Christmas")
elif D == "24":
    print("Christmas Eve")
elif D == "23":
    print("Christmas Eve Eve")
elif D == "22":
    print("Christmas Eve Eve Eve")

-d = int(eval(input())) -if d == 25: +D = eval(input()) +if D == "25": -elif d == 24: +elif D == "24": -elif d == 23: +elif D == "23": -else: +elif D == "22":