'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);