import sys



d = int(sys.stdin.readline().rstrip())



def main():

    return 'Christmas' + ' Eve' * (25 - d)



if __name__ == '__main__':

    ans = main()

    print(ans)
import sys



d = int(sys.stdin.readline().rstrip())



def main():

    print(('Christmas' + ' Eve' * (25 - d)))



if __name__ ==  '__main__':

    main()
import sys

d = int(sys.stdin.readline().rstrip())


def main():
    return "Christmas" + " Eve" * (25 - d)


if __name__ == "__main__":
    ans = main()
    print(ans)

import sys

d = int(sys.stdin.readline().rstrip())


def main():
    print(("Christmas" + " Eve" * (25 - d)))


if __name__ == "__main__":
    main()

-    return "Christmas" + " Eve" * (25 - d) +    print(("Christmas" + " Eve" * (25 - d))) -    ans = main() -    print(ans) +    main()