function Main(input) {
	var day = parseInt(input, 10);
    if (day === 22) {
      console.log('Christmas Eve Eve Eve');
    } else if (day === 23) {
      console.log('Christmas Eve Eve');
    } else if (day === 24) {
      console.log('Christmas Eve');
    } else if (day === 25) {
      console.log('Christmas');
    }
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));