'use strict'

const main = input => {
	const args = input.split('\n').map(arg => arg.split(' '))
	const d = parseInt(args[0][0], 10)
	if (d === 22) console.log('Christmas Eve Eve Eve')
	else if (d === 23) console.log('Christmas Eve Eve')
	else if (d === 24) console.log('Christmas Eve')
	else console.log('Christmas')
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'))
