import java.io.*;

class Main{
	public static void main (String[ ] args) throws Exception{
		BufferedReader br = new BufferedReader (new InputStreamReader (System.in));

		for(int i = 1;; i++)
		{
			int n = Integer.parseInt(br.readLine());
			if(0 == n)
			{
				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