import java.io.*;
import java.util.*;

class Main {
    public static void main(String [] args){
        Scanner scan = new Scanner(System.in);
        int num = 1;
        
        while(true){
            int n = scan.nextInt();
            
            if(n == 0) {
            	break;
            	}
            
            System.out.println("Case " + num++ + ": " + n);
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz