> #include <iostream>
> using namespace std;
> 
> int main()
> {
> 	int p, e, i, d, cnt = 1;
> 	while(cin >> p >> e >> i >> d, p != -1)
> 	{
> 		p %= 23;
> 		e %= 28;
> 		i %= 33;
> 		int t = 0, s;
> 		while(s = i + 33 * t, 
> 			! (s > d && (s - p) % 23 == 0 && (s - e) % 28 == 0 ) )
> 		{
> 			++t;
> 		}
> 		cout << "Case " << cnt++ << ": the next triple peak occurs in " << s - d << " days." << endl;
> 	}
> 	return 0;
> }