> #include <iostream>
> using namespace std;
> int p,e,i,d,t,j;
> int main()
> {
> 	t=0;
> 	while (cin>>p>>e>>i>>d,p!=-1||e!=-1||i!=-1||d!=-1)
> 	{
> 		t++;
> 		p%=23;
> 		e%=28;
> 		i%=33;
> 		for(j=d+1;j<=21252;j++)
> 			if ((j%23==p)&&(j%28==e)&&(j%33==i)) break;
> 		cout<<"Case "<<t<<": the next triple peak occurs in "<<j-d<<" days."<<endl;
> 	}
> 	return 0;
> }