> #include<iostream.h>
> void main()
> {
> 	long a,b,c,d,t;
> 	for(int i=1;;i++)
> 	{
> 		cin>>a>>b>>c>>d;
> 		if(a==-1)
> 			break;
> 		t=d+33-(d-c)%33;
> 		while(1)
> 		{ 
> 			if((t-b)%28==0&&(t-a)%23==0)
> 			{
> 				cout<<"Case "<<i<<": the next triple peak occurs in "<<t-d<<" days."<<endl;
> 				break;
> 			}
> 			t+=33;
> 		}
> 	}
> }
>