import numpy as np



# 初期値を入力



D = int(eval(input()))



# メインプログラム



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")

elif D == 23:

    print("Christmas Eve Eve")

elif D == 24:

    print("Christmas Eve")

elif D == 25:

    print("Christmas")

import numpy as np

# 初期値を入力
D = int(eval(input()))
# メインプログラム
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")
elif D == 23:
    print("Christmas Eve Eve")
elif D == 24:
    print("Christmas Eve")
elif D == 25:
    print("Christmas")

-import numpy as np - -# 初期値を入力 -# メインプログラム