d = int(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()))

count = 25



if d == 25:

    print('Christmas')

else:

    count -= d

    print(('Christmas' + ' Eve' * count))
d = int(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()))
count = 25
if d == 25:
    print("Christmas")
else:
    count -= d
    print(("Christmas" + " Eve" * count))

+count = 25 -elif d == 24: -    print("Christmas Eve") -elif d == 23: -    print("Christmas Eve Eve") -elif d == 22: -    print("Christmas Eve Eve Eve") +else: +    count -= d +    print(("Christmas" + " Eve" * count))