    function main(D){
    if(D==22){
      console.log("Christmas Eve Eve Eve");
    } else if (D==23){
        console.log("Christmas Eve Eve");
    } else if (D==24){
        console.log("Christmas Eve");
    } else if (D==25){
        console.log("Christmas");
    } 
    }
    main(require('fs').readFileSync('/dev/stdin','utf8'));