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