#include <iostream>;

using namespace std;

int main(){
	int n; 
	int number = 1;
	while(cin >> n){
		if(n < 0){
			break;
		}


		int counter = 1;
		int copy = 0; 
		while(counter < n){
			counter *= 2;
			copy++;
		}

		cout << "Case " << number << ": " << copy << endl;
		number++;
	}

	return 0; 
}