import java.io.*;
import java.util.Arrays;
class Main{
	public static void main(String[] args) throws IOException {
		int i;
		int n;
		String str;
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		for(i=1; ;i++){
			str = in.readLine();
			n = Integer.parseInt(str);
			if(n==0) break;
			System.out.println("Case "+(i)+": "+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