'use strict'
const i = require("fs").readFileSync("/dev/stdin", "utf8");
let r = 'Christmas ';
switch (i) {
  case '22':
    r = r + 'Eve Eve Eve';
    break
    case '23':
    r = r + 'Eve Eve';
    break
    case '24':
    r = r + 'Eve'
    break
    case '25':
    r = r;
    break
         }
console.log(r);