#include "iostream.h"

int main()
{
	long p , e , i , d;
	long s;
	long caseCount = 0;

	cin >> p >> e >> i >> d;
	while( p>=0 || e>=0 || i>=0 || d>=0 )
	{
		caseCount++;
		s = i + 33;
		while( s < e || s < p || ( ( s - e ) % 28 != 0 ) || ( ( s - p ) % 23 != 0 ))
		{
			s += 33;
		}
		cout<<"Case "<<caseCount<<": the next triple peak occurs in "<<s-d<<" days."<<endl;

		cin >> p >> e >> i >> d;
	}

	return 0;
}