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