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'));
