> #include <iostream>
> using namespace std;
> 
> int main()
> {
> 	int p0[10], e0[10], i0[10], d[10];
> 	int i;
> 	double p, e;
> 	int p1[10];
> 	int date[10], interval[10];
> 	int k = -1;
> 
> 	do {
> 		k++;
> 		cin >> p0[k] >> e0[k] >> i0[k] >> d[k];
> 	} while (p0[k] != -1 || e0[k] != -1 || i0[k] != -1 || d[k] != -1);
> 	
> 	for (int g = 0; g < k; g++)
> 	{
> 		for (i = 1; ; i++)
> 		{
> 			p = (i0[g] - p0[g] + 33 * i) / 23.0;
> 			if (p == (int)p)
> 			{
> 				e = (23 * ((int)p) + p0[g] - e0[g]) / 28.0;
> 				if (e == (int)e)
> 				{
> 					p1[g] = (int)p;
> 					date[g] = p0[g] + 23 * p1[g];
> 					interval[g] = date[g] - d[g];
> 					break;
> 				}
> 			}
> 		}
> 	}
> 
> 	for (int g = 0; g < k; g++)
> 	{
> 		cout << "Case " << g+1 <<": the next triple peak occurs in " << interval[g] << " days." << endl;
> 	}
> 	system("pause");
> 	return 0;
> }