function Main(input) {
    var D = input.split("\n")[0] - 0;
    var str;
    switch (D) {
    case 25: 
        str = 'Christmas';
        break;
    case 24:
        str = 'Christmas Eve';
        break;
    case 23:
        str = 'Christmas Eve Eve';
        break;
    case 22:
        str = 'Christmas Eve Eve Eve';
    default:
    }

    console.log(str);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
