function main(D){
if(D=="22"){
  print "Christmas Eve Eve Eve";
} else if (D=="23"){
  print "Christmas Eve Eve";
} else if (D=="24"){
  print "Christmas Eve";
} else if (D=="25"){
  print "Christmas";
} else {
  print "f**k!";
}
}
main(require('fs'),readFileSync('/dev/stdin','utf8'));