#!/usr/bin/env python3
import sys


def solve(D: int):
    print("Christmas" + " Eve" * (25 - D))


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    D = int(next(tokens))  # type: int
    solve(D)


if __name__ == '__main__':
    main()

8a33197f9d86973198b6e40957de6731dc56f813
<mask token>


def main():

    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    D = int(next(tokens))
    solve(D)


<mask token>

<mask token>


def solve(D: int):
    print('Christmas' + ' Eve' * (25 - D))


def main():

    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    D = int(next(tokens))
    solve(D)


<mask token>

<mask token>


def solve(D: int):
    print('Christmas' + ' Eve' * (25 - D))


def main():

    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    D = int(next(tokens))
    solve(D)


if __name__ == '__main__':
    main()

import sys


def solve(D: int):
    print('Christmas' + ' Eve' * (25 - D))


def main():

    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    D = int(next(tokens))
    solve(D)


if __name__ == '__main__':
    main()

#!/usr/bin/env python3
import sys


def solve(D: int):
    print("Christmas" + " Eve" * (25 - D))


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    D = int(next(tokens))  # type: int
    solve(D)


if __name__ == '__main__':
    main()
