var lines = [];
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});
reader.on('line', function(line) {
  lines.push(line);
});


reader.on('close', function() {
    var eve = ""
    if(lines[0] != 25){
      for (let index = 0; index < 25 - lines[0]; index++) {
        eve = eve + " Eve";
      }
    }
    console.log("Christmas" + eve);
});