"use strict";
function Main(input) {
    let D = input.split("\n").map((v) => v - 0)[0];
    if (D == 25) console.log("Christmas");
    else if (D == 24) console.log("Christmas Eve");
    else if (D == 23) console.log("Christmas Eve Eve");
    else if (D == 22) console.log("Christmas Eve Eve Eve");
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
