import itertools

import math

import fractions

import functools

import copy



D = int(eval(input()))



if D == 25: print("Christmas")

if D == 24: print("Christmas Eve")

if D == 23: print("Christmas Eve Eve")

if D == 22: print("Christmas Eve Eve Eve")
def main():

    n = int(eval(input()))

    # t, a = map(int, input().split())

    # h = list(map(int, input().split()))

    # s = input()



    if n == 25:

        print("Christmas")

    elif n== 24:

        print("Christmas Eve")

    elif n==23:

        print("Christmas Eve Eve")

    elif n==22:

        print("Christmas Eve Eve Eve")





if __name__ == '__main__':

    main()

import itertools
import math
import fractions
import functools
import copy

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

def main():
    n = int(eval(input()))
    # t, a = map(int, input().split())
    # h = list(map(int, input().split()))
    # s = input()
    if n == 25:
        print("Christmas")
    elif n == 24:
        print("Christmas Eve")
    elif n == 23:
        print("Christmas Eve Eve")
    elif n == 22:
        print("Christmas Eve Eve Eve")


if __name__ == "__main__":
    main()

-import itertools -import math -import fractions -import functools -import copy +def main(): +    n = int(eval(input())) +    # t, a = map(int, input().split()) +    # h = list(map(int, input().split())) +    # s = input() +    if n == 25: +        print("Christmas") +    elif n == 24: +        print("Christmas Eve") +    elif n == 23: +        print("Christmas Eve Eve") +    elif n == 22: +        print("Christmas Eve Eve Eve") -D = int(eval(input())) -if D == 25: -    print("Christmas") -if D == 24: -    print("Christmas Eve") -if D == 23: -    print("Christmas Eve Eve") -if D == 22: -    print("Christmas Eve Eve Eve") + +if __name__ == "__main__": +    main()