import sys



D = int(eval(input()))



if D == 22:

    print('Christmas Eve Eve Eve')

elif D == 23:

    print('Christmas Eve Eve')

elif D == 24:

    print('Christmas Eve')

elif D == 25:

    print('Christmas')





D = int(eval(input()))



if D == 22:

    print("Christmas Eve Eve Eve")

if D == 23:

    print("Christmas Eve Eve")

if D == 24:

    print("Christmas Eve")

if D == 25:

    print("Christmas")

import sys

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

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

-import sys - -elif D == 23: +if D == 23: -elif D == 24: +if D == 24: -elif D == 25: +if D == 25: